It is not. It claims it but the underlying cryptography doesn't support it.

I was surprised to read this.

I don't have access to the standard for the mDL's being discussed, that is ISO/IEC 18103-5 [1] but I have found a number of accessible resources [2][3] which suggest selective disclosure is supported.

I would be interested to learn more about the gap you suggest exists between what is claimed and what is, due to the underlying cryptography, possible.

Can you provide more details ?

[1] https://www.iso.org/standard/69084.html

[2] https://www.youtube.com/watch?v=sR5b7uuMiKk

[3] https://www.youtube.com/watch?v=AX2TdIlakNs (at 0:26 mentions selective disclosure as being "key" to the standard)

People are just telling lies. Each mDL has a unique signature that is always revealed even if other information isn't.