Who does? I think there's a [citation needed] for this claim.

China does.

The probably is there for a reason though, the exact extent of their capabilities is unclear.

Here's a citation: https://thediplomat.com/2022/06/chinas-directed-energy-weapo...

That's rumour, not a citation. Maybe I'm wrong and directed energy weapons can destroy thousands of satellites in LEO, but it's never been demonstrated by any nation.

It's a citation that they have them, which is all I claimed definitively. If I could cite the part of the statement after "probably", there wouldn't be a "probably" there.

I would not call it rumors. If you'd like a more authoritative citation, here is a DIA (Defense Intelligence Agency, i.e. US military) report cited in the article I cited above: https://www.dia.mil/Portals/110/Documents/News/Military_Powe...

Go read page 24. It doesn’t say what you are claiming.

Page 24 definitely doesn't, it's about Russia. Page 17 on the other hand

> During the past two decades, Chinese defense research has proposed the development of several reversible and nonreversible counterspace DEWs for reversible dazzling of electro-optical sensors and even potentially destroying satellite components. China has multiple ground-based laser weapons of varying power levels to disrupt, degrade, or damage satellites that include a current limited capability to employ laser systems against satellite sensors. By the mid- to late-2020s, China may field higher power systems that extend the threat to the structures of nonoptical satellites.

The discussion of current capabilities is primarily about optical satellites (though it can be read to include other components), but it probably applies to giant sensitive phased array antennas too.