Unsupported tanks behind enemy lines

[Imp]

It sounds like Andy has programmed the AI to use this defense so some extent.

Quite a lot actually make the rookie mistake of chasing running units at your peril. You need to scout & give chase not just charge as running into range of a group of 6-10 guns is not uncommon meaning you can lose much more than you gain.
Can be more problamatic than most humans as they tend to commit everything forgetting about defence in depth.