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The parasite can infect an enemy unit with parasites in melee using a barbed ovipositor (close combat weapon, parasitic infection is an ability from the ovipositor), and with a stratagem. What happens when i move over a unit and use enfolding strike, infect it with parasites, then charge, attack, and successfully wound the enemy unit with its barbed ovipostor, which would infect it with parasites ? Does it suffer 1MW in addition to any normal damage, or not, because it is already infected with parasites from the stratagem ?

Can i use enfolding strike to infect a VEHICLE ? The stratagem doesnt need to wound the enemy unit, and VEHICLES are not excluded.

ENFOLDING STRIKE

Use this Stratagem in your Movement phase, when a PARASITE OF MORTREX model from your army finishes a Normal Move or Advances. Select one enemy unit that PARASITE OF MORTREX model moved across this phase. Roll one D6: on a 2-5, that unit suffers D3 mortal wounds and becomes infected with parasites (see Parasitic Infection ability, on model’s datasheet); on a 6, that unit suffers 3 mortal wounds and becomes infected with parasites.

Parasitic Infection:
Each time an attack made with this weapon successfully wounds an enemy unit (excluding VEHICLE units), that unit suffers 1 mortal wound in addition to any normal damage and becomes infected with parasites. At the start of your opponent’s Command phase, for each enemy unit that is infected with parasites, your opponent must roll one D6:
On a 1-3, that unit being rolled for suffers D3 mortal wounds and is no longer infected with parasites.
On a 4-6, that unit being rolled for suffers D3 mortal wounds and remains infected with parasites.

I would say either you are infected or you are not. Hence it does not stack. (Stil do the mortal though.)

It would seem the stratagem can infect vehicles. Play it as is and expect an FAQ.

Maybe we should wait for a Codex to be in people’s hands before doing the edge cases?

Do you expect major changes in the codex ? All the rules discussed here have been shown on warcom, i very much doubt the rules pictures posted there will be different from those in the codex.

https://www.warhammer-community.com/2022/03/08/sighted-a-terrifying-new-tyranid-organism/
https://www.warhammer-community.com/2022/03/25/whats-the-deal-with-mortrex-and-how-did-it-get-such-a-vicious-tyranid-monster-named-after-it/

What happens when i move over a unit and use enfolding strike, infect it with parasites, then charge, attack, and successfully wound the enemy unit with its barbed ovipostor, which would infect it with parasites ? Does it suffer 1MW in addition to any normal damage, or not, because it is already infected with parasites from the stratagem ?

That's really no different from just hitting an infected unit a second time. Each time you attack with an ovipositor, you deal one extra MW and the unit becomes infected with parasites, none of the rules care whether it has already been infected or not.

Can i use enfolding strike to infect a VEHICLE ? The stratagem doesnt need to wound the enemy unit, and VEHICLES are not excluded.

Yes. Maybe an oversight, but the rule is crystal clear.