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From the rulebook FAQ v1.2:

Q: If an Independent Character is going to begin a game
joined to a unit when should this be done? (p48)
A: You should nominate which Independent Characters are
joining units at the start of deployment before you place
any units on the board. Note that this should be done
before you nominate which units are being held in
Reserve, Deep Strike or are Outflanking etc.

Ghazghkull joins a unit of Kommandos with Snikrot in this manner.

Page 48 of the small rule book says:

When an independent character joins a unit, it might have different special rules from those of the unit. Unless specified in the rule itself (as in the 'stubborn' special rule), the unit's special rules are not conferred upon the character, and the character's special rules are not conferred upon the unit.

So then, the Kommandos lose the Infiltrate special rule, as that is the only special rule that the unit possesses that Ghazghkull does not.

Snikrot's Ambush special rule says the following:

If the owning player wishes, Snikrot and his unit may be held in reserve. When Snikrot and his unit become availible from reserve, they may move on from any board edge.

So, Ghazghkull would already be a part of the unit when reserves are declared, as per the new FAQ. Once the IC has joined the unit, he is considered to be a part of the unit.

Here's the crux of the debate: it would not appear that the Kommandos would lose the ability to use Snikrot's Ambush, and Ambush is not a special rule of the unit, it is a special rule given by an upgrade character that applies to the whole unit. Therefore, Ghazghkull would be able to Ambush with Snikrot and the Kommandos.

So... with this FAQ update, is this tactic now completely legit?

They have never lost the ability to ambush, before the FAQ or after.

It was already legit, people just didnt like it.

I'll not be telling my friend about that particular loophole.

The FAQ update just clarifies that it can work.

I used to believe it was not a legal move but one of the conversations here swayed me long ago.

So yes, the FAQ says it can be done.

I don't think the FAQ really changes much in terms of the Snikrot ruling.

You're correct in your analysis of the Kommandos losing the Infiltrate special rule, and then relying on Snikrot's Ambush ability.

Being able to put ICs with Snikrot basically depends entirely on what "Snikrot and his unit" count as. Does Snikrot, the Kommandos, and Ghazghkull count as "Snikrot's unit"? Or does Snikirot, the Kommandos and Ghazghkull count as "Snikrot's unit with Ghazghkull attached"

This is an instance where I believe it's legal by the RAW, but totally illegal by RAI. It's a result of poor wording on Snikrot's ability.

I think it's personally quite clear that the codex authors mean to say that Snikrot and his Kommando unit may Ambush, and attaching additional ICs to his unit was not anticipated. I believe it's phrased in such a way that the authors assumed that any IC's attached to the unit would lose the "Ambush" ability just as they lose the "Infiltrate" ability of the Kommandos.

Unfortunately the Ambush rule is poorly written, and the 5th edition rules on ICs joining units don't forbid it.

Personally, I believe that a unit with an IC that has joined it is never referred to simply as "Unit A". It is referred to as "Unit A joined by IC A". This is how ICs and units are referred to throughout the majority of the BRB. This, in combination with Snikrot's poorly written rule is why I say it's RAI that an IC cannot Ambush with Snikrot.

By the RAW, however, I believe you can.