4. AFAIK - is not good enough. where is your factual proof?
I appreciate your reply though
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I think you mean 5?
Section 36 of the Road Traffic Act 1988 makes it an offence not to comply with a lawfully-placed road sign. In specific areas - e.g. London - that offence has been "decriminalised", and can be enforced by the highway authority.
So, yes, TfL can issue a PCN provided the sign has been lawfully placed, which brings us back to your original question about the TRO. Like New Judge, I'd be very surprised if there isn't one in place, but stranger things have happened.