I hope you are simply not familiar with the situation and not FUDing around.
The "false premise" was that GlobalSign has refused to issue new certificates for Sberbank and there were several cases of CAs revoking existing certificates. They eventually have found a CA (Harica DV) which was willing to issue new certificates, but it was not clear at the time that such CA will be found and the new certificates can be revoked at any moment after a new wave of sanctions or simply after a strongly worded warning from Washington or Brussels. Relying on a relatively minor Greek CA for bank operations is clearly not a good strategy in their situation.
The "false premise" was that GlobalSign has refused to issue new certificates for Sberbank and there were several cases of CAs revoking existing certificates. They eventually have found a CA (Harica DV) which was willing to issue new certificates, but it was not clear at the time that such CA will be found and the new certificates can be revoked at any moment after a new wave of sanctions or simply after a strongly worded warning from Washington or Brussels. Relying on a relatively minor Greek CA for bank operations is clearly not a good strategy in their situation.