In addition: the heaviest tank in service with the Heer in 1936 in any meaningful numbers is the Panzer I. The Panzer II was about to go into mass production, the first Panzer III didn't leave the production lines until 1937 and the Panzer IV barely made it off the production line in 1936.These are mostly paper units at this point and absolutely not fully equipped and with vastly inferior preperation and training. Even if this was not the case this would still be a wholly inadequate force. Roughly half the one that invaded poland and a significant part of it would not be able to partake.
So there are no floods of panzers to speed the way into Poland.
Any anti-tank gun or even anti-tank rifle can have a PzI for breakfast.
A German invasion of Poland in 1936 will not go far and will probably end up with Hitler getting arrested by annoyed Heer officers.