3 Star Generals tend to have influential friends in high places. Firing them can get messy. I also doubt he willingly sacrificed so many of his men as cannon fodder, and probably has the proof safely tucked away.
Teplinsky was brought back to be the designated fall guy for all of the new VDV losses happening in Bakhmut after VDV was sent in to replace Wagner trash troops destroyed by Ukrainian artillery on the flanks.