Like the sibling comment mentioned, there's still lots of .net framework apps that target IIS. I haven't used IIS in about 15 years, but this looks like it provides a similar feature set to what Octopus Deploy had back then (Octopus seems to have changed a lot since then). i.e. more than what VS deployment can do.

There is still plenty of Window Server using enterprises churning out .Net Framework code that must run on IIS. It's shrinking market for sure but it's still a market.

If they are willing to spend money on Windows Server, 3k a year to make it not less painful is probably worth it. Remember, any company using Windows Server is not hiring skilled DevOps/SRE/Ops, it's probably average at best, low paid workers. It's the type of people who have probably never heard of HackerNews either so it makes advertising here an interesting choice.