The title is as misleading as it is wrong. HelpingHans complained about the guard sniper combo and how difficult it is to counter that strat as OKW.
The guard-sniper strat has always been really hard for OKW to counter. Nothing in the last patch has changed or exacerbated the issue.
Is it a potential balance issue? Yes.
Has it anything to do with the last patch? No. Furthermore, it's not allies. It's the synergy of two Soviet units and the lack of counters on the OKW side.
"You're teamkilling for fun probably, but no one take care of your actions in game as in real life. Get rekt by Putin in your country and with the corruption" Yeah this guy got very mad.