It will dude. If his SS in fact didn't meet the necessary regulatory requirements to be one, then admissions of all his previous trainees are strictly speaking defective unless the LP(A)R contains some kind of waiver or saving provision. I don't believe there's such thing.

If those defectively-admitted lawyers provided legal advice or services that turns out problematic, it has implications on their professional insurance cover.

There's a whole cascade of s hit down the line which is why CHT is understandably perturbed.