How many flame half-tracks do you see nowadays along with 222s even in the tourney games? Because from NA ESL, unless it was from me, the number of 251/222 units ranged from 0-1. That should be telling how useful/less Ostheer light armour is.
Also I'm sorry, but just because the Brit's anti-light vehicle option suck outside of ATGs and AEC doesn't mean the 222 should remain as it is. Pretty sure if the 222 gets changed, other stuff would need to be change in response, but this is about 222 not Brit anti-light armour. Furthermore you ignore the cost increase of the 222, delaying its timing giving units like the Bren, M20, and M3 more time to work.
Why not buff the 222 which is in more need of help than the Ostwind which is also locked behind BP 2 and T3? This would help expand Ostheer's lack of light vehicle play outside of call-ins in the current meta of Allied light armour rushes.
You know why you don't see flame HT's built against UKF in tournies? Because noone plays UKF in tournies. The matchup is already pretty in favour of Ost which roll UKF early game without the need for more Ost buffs.
If you had played more than three UKF games in matchmaking you would know this, 222 gets built against you in pretty much every single game as it's a delete button for your bren WASP.
Speaking of tournaments I saw pretty great use of the 222 against USF in ESL, guess how much use of UKF we saw (oh wait I just mentioned that didn't I)
If it was in need of a revamp it would never be touched (just like the sexton or *cough* Greyhound *Cough*)