That is correct.
The cost of setting it up is immense, and you are seriously overblowing it's effectiveness on the field. It does not have brace, it does not outrange AT guns, and Sturmpios have the lowest repair speed out of all repair units. It does not require the combined arms approach of a Bofors, nor is it as cheap, nor does it wipe infantry in under a second. Get one tank destroyer, one AT gun or one indirect fire unit and start firing at it.
Lmao this is so gardening ridiculous. On the one hand, you insist "l2p" re: killing the truck, then you suggest using "one AT gun" as a reliable way to kite the thing as if any OKW player who has been playing the game for more than 30 seconds will lose his Schwerer to a single ATG attacking ground.
The Schwerer is simply too potent an emplacement in its current state for what it costs the OKW player. There is nothing unreasonable about suggesting that it is overperforming for its cost, same as any other unit in the game.
It suppresses, snipes, and kills infantry at long range, it annihilates light vehicles and armor, it reliably penetrates all medium armor except the Easy 8, T-34/85, and maybe Cromwell, and it shoots down planes consistently. It is by far the most versatile and effective emplacement in the game, and it is constructed every game and costs nothing beyond OKW's normal tech costs.
Whether you consider it free or "part of the price" of OKW's teching, it overperforms for what the OKW player pays for it, relative to what other factions get for teching to a comparable level.