Yes, our Clavinova is about 25-30 years old (not sure how old since it precedes my marriage). It hasn't been used much before I started playing almost two years ago, but the keys are decidedly "clacky". Funny enough we saw that YT video as well, though we haven't ordered parts for it yet. I just asked my husband, but he doesn't know where to get those parts either. I just live with the loud clacks for now 🙂
Sorry I wasn't able to be of more help 🙁