LOL no
unlike the other mainline upgrades the PPSH have severe tactical downsides that do not really synergies well with the unit holding them unlike the others
Grenadier MG42: unit focused on long range so the slight inconvenience of not being able to fire the MG42 on the move is not that big of a deal since you are supposed to keep at range anyway.
Section Bren: see Grenadier
Volksgrenadier MP44: mid to short range damage increase that is useful in all engagements
Bar Rifles: see Volksgrenadier
Conscripts: Increase short range fire power (and I mean stepping on toes short) in place for mid to long range fire power on a unit that dies fast and has no smoke.
So no, switching 7th man for PPSH would not be OP as they stand now.
i guess u never uses ppsh cons with sprint? they close the distance with losing mostly one model. after this they shred all above other units u mentioned.