There is probably a lot of old T-54/55 in that count.
The Saudis bought from the Brits. I think they have Challengers. Great tanks, but they don’t have 20,000 of them. There are not 20K Challengers in the world. Heck, even if you include APCs and IFVs, I don’t think they have 20K AFVs.
This whole thing is ridiculous.