As with everything, it depends on what you mean by the term. Battalion Tactical Grouping just means a combined arms (tank, infantry, engineers, etc.) force of around 500-600. That is unexceptional. Combined arms is fairly settled doctrine.I’m wondering if the Russians are starting to rethink the effectiveness of their Battalion Tactical Group model
If you mean the Russian technique of cannibalizing two battalions out of a regiment to form a battalion (because soldiers are missing, equipment is unserviceable), then yes, they should relook that.