Love how it is supposed to improve your fitness, strength, whatsoever for every
sport... I wonder why we didn't have one of those when I was still playing Lacrosse.
You should be glad some people talk sense to you. Total waste of money, basically anything should be better. Apart from that, a good physiotherapist should be able to give you advice - and I don't mean that 'wait till you get better' rubbish. Actually, I would try to get an appointment with someone who takes care of athletes - I have no clue where to go in the UK, but if you want to find out you probably can. You shouldn't waste your time with the equipment you posted, and possibly not with physiotherapist you're seeing.
& I wouldn't try to get myself specific advise on physical therapy online. That's ridiculous (you need someone qualified to have a look at you and then tell you what to do), every single person who'd seriously tried to tell you what forms of physical therapy to pursue should be banned.