I don’t work for Focusrite anymore, but that’s a fairly standard response in any industry. If you want a warranty repair, buy new (I think Focusrite’s is a pretty solid 3 years), if you’re buying used, you’re sacrificing the warranty for a cheaper price, and you accept the potential for paid repairs.
I feel like that’s on you.
FWIW, when I left, I believe that Scarlett hardware ‘failures’ within the warranty period (first 3 years of life) were <1%, so any issues on that front is pretty unlucky, with almost all repairs coming in under 1 hour. I wouldn’t have thought Clarett’s are much more than that.
Cheers
Si