That's a good question, Goodluckanddontfitup.
Even if it was true, it's just an anecdote. A difficult and disturbing thing to happen to a woman - a woman - who has already suffered cancer and a double mastectomy.
But all it proves is that a woman said something difficult and disturbing to a woman in a changing room. It shouldn't have happened, but if it did happen it was an anecdote, and shouldn't be used by anyone - least of all a lawyer! - to critique a ruling of the UKSC.
It's the same with the 6' butch lesbians/muscly transmen who seem to be so common in women's toilets since the SC ruling - it's highly unlikely any of these stories of them being 'hounded out' are true, but if they were, they are just anecdotes.
Laws don't operate on the level of anecdotes; nobody says that there's something wrong with laws protecting property just because some poor unfortunate was wrongly pulled aside for shoplifting when in fact the magnetic tag had been accidentally left on..
If any of these anecdotes are true, which seems highly unlikely, they are unfortunate, but they don't actually challenge the SC ruling about the definition of the word 'woman'.
They are being used to sow confusion, to try to undermine the principles of the SC ruling The quivering voice, the sad face, the lovely lovely transwomen, the 6' lesbian friends... we see through the act, and it doesn't stack up against 88 pages of legal argument that 'woman' = 'biological woman'.