There the conclusion was, that the surprisingly low stats of Sweden are in fact historically correct...
Yes, if you do not regard 'tech level' as a strict measure of intrinsic technology, but rather a mix of technology and general economic punch (e.g. the ability to hire hordes of mercs at short notice.)
In the case of Austria I have a hard time seeing how Bohemia could have a higher tech level from either perspective though. From what you are saying it sounds like Austria has a rather significantly lower tech level... Maybe there is still something I don't know though.
/Doomie