I don't have time to read the whole thread now but I think it's important to remember that we are currently facing a male mental health crisis.
Here in northern Ireland the rate of suicide in males has become really frightening. If something like this came here I would 100% be buying my husband a ticket.
I think it's ok for everyone, regardless of gender, to take a break, to disengage from the everyday and recognise their own needs, likes and to feel comfortable in their own skin. Not having to fit into the Patriarchal society like OP says.
The very fact that this has caused a thread on Mumsnet shows how rate it is for there to be an outlet like this for males. I for one think that's very sad.
Each to their own.