Poor Val.
I'm a speech pathologist - but not a specialist in voice/laryngectomy. It seems apparent that Val has had a neck dissection (where the lymph nodes in the neck are removed) - hence why his neck looks very 'thin'. It seems the tumour/s and/or the treatment (surgery, radiotherapy) has/have affected the function of his soft palate - which elevates during speech and closes off the nasal cavity (except for the nasal sounds, which are m, n, and ng in English); hence why he sounds so 'nasal'.
It also seems he has some issue with managing his oral secretions (hence the sleeve wipe), and has a reduced range of moment on the right* side of his face and with opening his jaw.
(*this video is shot in mirror image)