As discussed when we spoke, there is nothing stopping him from taking this further, even if he is in the wrong. Each party has the right to put their side of the story forward for independent deliberation, although of course it does not mean they will be successful.
So your position now remains largely the same - you cannot be forced to pay him anything at this stage - it is still just a request on his part, which you are free to dispute and challenge further.
If he wants to go to court, he can. If he does so though, you will have good grounds to challenge it and to dispute what he is after. In the event he is somehow successful, your liabilities will not be too large and worst case scenario is that you pay for what he is after and the court costs (which won’t be too high). However, based n what has happened so far I doubt you will ever be found responsible for all that.
I trust this has answered your query. Please take a second to leave a positive rating by selecting 3, 4 or 5 stars above - this is an important part of our process and recognises the time I have spent assisting you. If you still need me to clarify anything else, please reply on here and I will assist as best as I can. Thank you