I don't think this theory holds up

• The flight in question returned to Al Udeid air base at 1405, over an hour and a half before the explosions. For it to have refuelled the Israeli jets they'd have to have just been hanging about off the coast of Doha for all that time
• The air base it's flying out of is a Qatari one, meaning the tanker would have had to return to the Qatari base immediately after facilitating an attack on Qatar right in Qatar's line of sight
• An RAF tanker flew the same route at the same time for several days beforehand, so it doesn't seem like this was an unusual one
• Israel has plenty of its own tankers
• Surely the Israeli jets would not have refuelled right outside their target?

On top of that, 2,200 km is not the distance for a plane to fly from Israel to Qatar, it's the distance for a car to drive. It's 400 km less than that in a straight line, or 300 km less if you want to approach Qatar by flying over the Persian Gulf

One problem with this story: the UK and Israel use different, incompatible midair refuelling systems (Israel uses the US one, IIRC).

Qatar said this was a scheduled refueling training with the UK. So this is probably nothing unless they fully coordinated their own bombing with Israel.