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I saw on Blood of kittens that it simply needs to be a CSM formation, but with the new supplements, a CSM formation would be Black Legion formation in addition to being a csm formation.
So would it be possible to use the dataslate version of kranon's helguard as a Black Legion formation?

From what I understand the dataslate should still be valid after all.

Well Heck, I was all ready to say that was wrong but...

Dataslate restriction is Chaos space marine faction. Doesn't mention crimson slaughter at all in the rules.

It is otherwise identical to the new crimson slaughter formation. It could be argued the new one replaces it, but I don't buy that argument particularly(its still available for purchase, and the new faq allows old formations)

Calling it black legion is cheeky tho. I guess it's allowed,but why would you?

Well it gives Black Legion a wee bit more choice. It's not that much of a stretch either fluff wise, you could get away with it by saying that particular formation is part of a black crusade where they happen to be acting under abaddons orders or something along those lines. I vaguely remember that being canonish, though don't hold me to it.

As for personally, I think I might be able to replace the land raider and helbrute with landraider/dreadnought variations in my play group. This would give me an excuse to field a land raider achilles rather than the lacklustre Land raider we get. And I think this particular formation bonus works just as well with Black Legion if playing against the imperium.