Your average dev is sick 7 days a year so it's only natural

10x dev ... so sick 70 days a year is the target

I wonder if I'm being saved by remote working since I think I have three days in the 365 days, and I've also managed to go years without a single sick day.

I hope you are still taking your maximum possible* number of sick days regardless.

*if you live in a real country, which gives all workers unlimited paid sick leave, I am defining "max possible" here as "as many as you can reasonably take without your boss doing something about it"

Not really. Although with how soul-crushing working has become lately, maybe I ought to.

and the two 9's aren't in order

Sure, software engineers have less than two nines. :)