That’s my takeaway as well:

They found the elevated cardiovascular risk was consistent across socioeconomic groups, and strongest among smokers and people with diabetes or existing heart disease - suggesting they should be especially cautious about long-term, narrow eating windows.

I’ve been following 16:8 fasting for 2 years, mainly to lose a couple of pounds, not because of pre-existing conditions. I’ve been able to get down to my ideal weight because of it, and so far don’t really feel any bad effects.