From what I heard Congress approved money for their training like half a year ago, not that they're being trained. It wasn't on request of the WH either, so I'm not entirely sure Biden jumped in on it back then.

Also hearing how long the US believes its gonna take till the Abrams are operational (including supply line and training for soldiers/engineers) I kinda have to doubt the whole "we planned it all a year in advance but just held back the actual hardware (e.g. fighter jets) for now."