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Not sure where you get that URL

I only see https://open-dot.net (which redirects me back to https://github.com/open-dotnet)

*He

Edit: Before I get downvoted for genderizing - I mean that it is one person.

'they' is generally always appropriate to use especially when it's a person you don't know personally. Heck, we use it for companies which are grammatically singular (in american english)
Here it is in fact one person though, which is also relevant to mention
And "they" can be used for one person though
... but as they just told you, doesn't hightlight that it's just one person, not multiple, as they wanted to do.