A "Sub-forum that only registered members access" is by definition a "private members club".

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"Private Members Club" is actually a sort of legal status in the United Kingdom, where ~tl is located.

Based on a few quick searches these clubs may have something to do with racism or sex discrimination in the UK. It is a loaded phrase.

Here is a quote from a government site:

Q: My company provides a social club that all employees are automatically members of. The company itself has no control over the running of the club. Some of the facilities can be used by men only and they refuse to let women use them. Can I do anything about this?
A: It is unlikely that your club would be considered a private members' club if all employees are qualified to join without undergoing any selection procedure. Therefore the facilities provided by it would be covered by s.29 of the Sex Discrimination Act 1975 (SDA) and must be available to both sexes.

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We can extrapolate from this that members of a "Private Members Club" must undergo a selection procedure. Free and open forum registration is not a sufficient selection procedure, as anyone may register regardless of race, origin, age, gender, sexual orientation, wealth, status, etc.

Therefore, such a forum is NOT a "Private Members Club", at least in my limited understanding.

It remains to be determined, however, if a lawsuit regarding 68kMLA would be governed under the laws of the United Kingdom or under the laws of Plano, Texas, USA where the server appears to be located.