All armor got affected indeed, but the end result is not the same for everyone.
German armor (except dedicated anti-inf armor) already lacked anti-inf capabilities, while soviet T70 and T34/76 where very potent against infantry. Post patch the playing field should be somewhat more even.
Yes, Ost armor AI went from bad to worse, whereas Sov armor AI went from good to ok, when moving.
Really I see it as primarily aimed at the somewhat retarded previous armor kiting/chasing of infantry. Some armor would yoyo in and out, taking pot shots that caused 1-2 models attrition per hit. Its a good change. Armor moving accuracy was already adjusted vs armor sometime ago, and it was high time that was reflected on infantry too.
Returns a bit of realism too, indirectly. Moving accuracy was terrible on armor in this period, before the advanced suspension and gyro/gimble systems armor has today.