Here it is, Oct 2024; I had the same question and ran into your post. I have phone and email support, and the same thing; PayPal is replacing support for simple cut-n-past button code with that generic reply above, sending you to an advanced developer area for system migration with all kinds of 3rd parties. So I am just using their tool, still available today, copying and pasting button code generated as I always have. Since they have yet to reply to your reply or my email support (the guy on the phone said he would get more advanced support to contact me, but it never happened.) So, like you, I will just have to wait and hope the buttons PayPal generated today do not stop working someday.
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