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So can't remember the name of the Tunnel Strike Stratagem that Tyranids get, but it's the one that's jormungadr (the +1 cover save hive fleet) exclusive. It allows a unit for 1 command point to be deployed in the tunnels w/ Raveners, Trygon, Mawloc, and deploy with them as long as all models stay within 3".

Now for that stratagem it mentions that you do this during deployment, whereas roving patrol states when you roll the unit to come on, it then deploys via deep strike if it has it. Now my question is, would this stratagem work w/ this mission type? Other than the first squad coming in, could the rest of the army say they are going to tunnel deploy and then hope one of the tunneling units comes on? My opponent Had a squad of ravener is reserve for his 1/3 of the army that deployed, and the rest of them he failed to roll to have them come on. He then rolled for 2 squads of 20 Genestealers to come on the table, but stated since none of the tunneling guys showed up, he'll just wait for turn 2 to bring them in. Is this legal?

They come in whenever you set up a "unit of Raveners, a Mawloc, Trygon or a Trygon Prime". If you happen to roll and get such a unit, the unit deployed in the tunnels gets to come along too.

Worst case scenario they will arrive on turn 2 at the latest.

However, I can easily see the argument that the mission rule prevents you from placing the unit "within
tunnels bored before battle", since they have to go into "Reserves" as specified by the rule.

Chalk this up to another "Not enough information to clear up contradictory instructions" situation.

Yeah, I let him do it also due to how ambiguous the rules were. Just seems super strong.