You can claim that it's very stable but the ecosystem (support, tooling, community, etc) is simply not there yet to make .NET core one of the most attractive techs in the market right now.
Personally I don't think it's a sponsored post. If the author of the post didn't recommend something to workaround the issue, readers (especially non-technical one) might think there's no solution to the problem.
Ideally the author should have mentioned about Firefox as well but he/she might not have used browsers other than Chrome, IE/Edge.