Here's a couple of screenshots of the ability in action:
Direct fire AT mode -
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Indirect fire artillery mode which is the current one in the vanilla game -
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You can test it here: https://steamcommunity.com/sharedfiles/filedetails/?id=1562660350
Along with it are a few other things which he is experimenting with it like a new Radio bunker model and new trench.
Sadly he deleted the repair station from the preview picture after it was declined by the community mod team back in the revamped commander patch so there's no point in looking for it.
He's also responsible for the grenade fix and other things which were implemented a long time ago into the game.