Sorry that you're going through this. Can sometimes feel like a never-ending nightmare. I've dealt with a truck ton of palliative care in other animals. One large dog we took in suddenly couldn't feel his back end. Literally. Fed, walked. 2 hours later this. He had a lesion on his spine and he was done for due to his size.
Another case we had she often went wobbly - at least once a day. But she would recover and lived a really long life.
It's harder the bigger they get ofc.
Based of what you said and upon certain conditions, I would personally take it week by week. My big question to you: is he in pain? This is usually where I'm not willing to compromise regarding palliative care. If they are in pain with poor outcome, where the majority of their time is hurting or struggling, then it's just unfair to all parties.
If he is not in pain (you know him best) and it is neuro I would give yourself more time. Give him more time. I have literally seem amazing recoveries where the vet/professional said to PTS. I weighed in the pain factor, I weighed in the logistics of caring for said animal and decided to give them time. Time has often paid off. But it doesn't always.
Do you have the facilities and ability to care for him in this capacity? Let's say he stayed like this forever, wobbly, but relatively pain free (or well managed). Maybe he's a bit wobbly but far better than your videos. Obviously being crooked would lead to later pains and aches. Let's say you learn to trim him foot by foot in an open area with soft landing. Or next to solid wall you could lean him up against and strapped such a way that the only way he could go is literally down onto some straw. You'd need the help of 3-4 people. One of these persons would solely act as as your spotter so to speak. Stand close, arms ready and if he were to go a bit funny their sole job is to yank you away. You'd need serious people, to never let their guard down. To never let your own guard down. Deep bedding and all the other careful considerations you'd need to take. Is it sustainable?
It is too early to tell IMO. You need to be able to treat him so as long as he's relatively sane still and if possible, if safe, to try get him desensitised as best you can, pronto.
Are you 100% certain neuro? Seen loads of animals that go wonky coz they put their back out, to the point you'd think they dyin' but a week later pick it up. A lesion on the spine as in one of my experiences. It could very well be a knock on the head. And take what
said about sodium seriously, especially if you live in a hot climate. If you aren't sure about the role of salt/sodium (electrolytes!) and neuro issues then go look it up. It plays a huge role in the management of neuro issues in humans!!