It's not a BIG, big deal.
It is a precautionary action. NOT unsafe.
A pan is required if you expect that you may start using reserve fuel.
Having made the decision to divert, the crew is probably now using diversion fuel. Unusually, a second diversion was required.
Therefore on arrival at the diversion, they may start burning reserves.
You want ATC assistance to avoid any further delays.
With weather conditions stated, then other aircraft may choose to divert also, but the aircraft expecting to use reserve fuel will need to arrive without delays.
Not close to disaster, because procedure was followed.
Difficult to say how much fuel he should have had. By all accounts, enough.