Seems like these changes are mostly about fixing the following balance issues.
1) Soviets being generally weaker than allied
2) Base pushing is too strong
3) High tech units are not utilized
I don't really know what to think of flame tower projectile speed change. Flamethrower is quite slow projectile speed in real life. I don't think it's necessary change but as a soviet fanboy, I'll take it.

Sam site price reduction seems reasonable. Allied AA turret is much stronger and 7% price reduction should not break anything.
Wall change is definately a good change. It is really frustrating to play against someone who builds tons of walls to slow down a push. Walls can be gamebreaking and it's still weird how rarely they are utilized.
Allied tech center HP change seems reasonable. Paradrop being able to single handedlly destroy a tech center is too easy.
Barracks HP nerf seems like a good idea in order to nerf base pushing. HP / cost ratio was insanely high.
I don't have anything to comment on Helipad and Airfield price increase. What is the reasoning behind it?
Light tank change seems cool. Today someone actually complained about their fast rate of fire being annoying to listen to. Allied lack viable early game eco harass options and it's cool to give them an option for doing so.
MCV production change and speed feel like good nerfs to basepushing and it doesn't make sense how people almost use their MCV for scouting. These changes should incentivise players to scout where they are expanding and that should be good.
I'm in favour for high tech unit cost reduction. All those units tend to be support type of units most the time. None of them feel gamebreaking on their own. I assume it is no accident that tesla trooper build time was not changed.
Yak and Mig vision change seem good. It's common to lose a Yak even if you are paying attention because of planes' move pattern. Allied helicopters are much easier for vision because of their easier maneuverability.
Paradrop, parabomb and spy plane timer reductions feel alright. Allied GPS is still much stronger ability than all soviet support powers combined. I think this type of game features are cool because they make the two factions assymetrical. In terms of their support powers, soviets have advantage in midgame because their powers become online earlier and allied have advantage in ultra lategame with GPS.
All in all all these changes are quite small and I don't see anything being gamebreaking. I generally prefer small changes instead of major fundamental changes. For this reason I'm more in favour of Experimental V2.1 balance or Omnom's MCVedit instead of more game-changing TABedit.