In the podcast namespace document, “chapter on GUID”, you provide a clever solution to indicate a podcast source across platforms.
But you're using the whole hash parameters, that may be an issue if you add a partial url hash as in a Media Fragment Standard. By example, using a time indication on a named audio element in a web page (personal example with #sound&t=10m)
I recommend to use instead a notation as follow :
The format of the link is https://(a podcast website link)#fastfollow-(type)=(a podcast guid)
In case of a fragmented hash with media fragment support, it would become : https://(page)#t=10&fastfollow-podcast=(guid)
Comma , can be used in the values part of the fragment for separating more elements. It may be fastfollow-podcast=(guid),(hostname)