No. What I'm saying is that if you want to know how much developer time Debian's donation buys, you need to look at how much it costs Peertube to buy developer time, which includes all taxes Peertube must pay on employment, not just how much of that money shows up on the developer's paystub.
I never said anything about that. Just arguing against your false claim "there are no additional costs for the employer". If you mean something else, say that instead.
No, I meant what I said. People think those are "additional costs" just because their payslip says "additional costs". To the employer, it's a simple math of "employee costs me X" compared to "employee earns me Y". All successful companies have Y > X. All bankrupt companies have Y < X.