Firstly you are doing exactly what you accuse others of: making assumptions based on flimsy evidence. The only 'claim' - nothing official - that I have seen is that the club might be considering legal action.
Defamation in this case (actually libel, not Tubey's slander) would depend if normal unbiased people thought that what they published affected the reputation of the club negatively in a concrete and commercial way, if it was wrong and if they published it
believing that what they published was correct (no 'absence of malice' as in the USA).
If the club (and this is as big an if as if they recorded the discussion secretly) is considering legal action, I would be interested whether they were rather considering action under data protection and privacy laws (after my time), especially with reference to EU protections.
Of course, just lawyering up has the effect of making any publication get very careful about what they publish, which may well be the intent here.