I accept your opinion.
Yet, please remember Grey Zone is a questionable far-left biased source with promotion of propaganda, conspiracy theories, and consistent one-sided reporting.
Same story different source :-
In the military unit in the Belgorod region, where the mobilized Russians were stationed, there was a shooting - dozens were killed and wounded, - social networks region, Belgorod, BelgorodskayaOn the evening of October 15, social networks reported that a shooting occurred in one of the units of the Russian army in the Belgorod region. According to preliminary data, there are dozens of dead and wounded among those mobilized.
As Censor.NET informs, this was reported by the Operative ZSU telegram channel.
The message states: "Telegram channels report 22 killed and 16 wounded mobilized in a military unit in the Belgorod region. It is previously known that three men took part in the shooting. The information needs to be verified."
Other Telegram channels , with reference to the Russian mass media, report that three soldiers opened fire in a military unit in the Belgorod region. Two of the three shooters were killed by fire in return, one escaped. The information has not been officially confirmed.
https://censor.net/ua/n3374003
At least 11 killed, 15 wounded in attack at Russia military training ground, RIA reports
Reuters ^ | 10/15/2022 | Reuters