This should help explain the situation somewhat.


Seeing WS ALL RWY isn’t something you see in MAN and the pithy cumulonimbus clouds that generate the RETSRA are nothing compared tho the colossus super cells that the bottom end of the gulf receive at the change of the seasons.
These things are humongous and will make you realise the washing on a spin cycle is having an easier ride that you being battered about in them. The next cell group just off the coast is another beast and is blocking the airways structure. Many carriers are not flying into Iran at present and flying up and down the tightly packed airways structure up and down the gulf on days like those required continuous headings off track to avoid. Left and right up to 100nm is not uncommon at all and you end up blinding off the Iranian and Doha/Bahrain/Saudi FIR boundaries the entire way. Mix this in with around 100 aircraft all doing the same thing and chaos reigns, hence a ground stop to restore order. I would be surprised if the OP posted a photo similar to Dubai in early 2020 such as this;


D gates just to the right of the window and the entire apron flooded in 2 feet of standing water

Having had the displeasure of operating around there on days like this, the ground is a better option until it clears up a bit.

ETA - BA 109 routes via Saudi and diverted around about the time it entered UAE airspace or just prior. EK 4 and EK 6 both departed an hour either side of BA 109 and EK still route via Iran, they both held over DXB for the earlier departure, and via a multitude of different holding point for the latter departure, both for over an hour. 1:30 just about for one of them and around 70 minutes for the other. I doubt BA 109 was carrying sufficient fuel for such extended holding too, and it may well have been the case that there wasn’t a route through the weather to get to DXB from the Bahrain side.