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Serious question: what is HTBQ+?

Googling doesn't seem to turn anything up.

It seems to be a variant on LGBTQ. Except I guess with "Homosexual" replacing "Lesbian and Gay".

Correct, in Sweden we call it HBTQ+, and "Karlaplan" is a location in Stockholm. Seems likely whoever wrote this is from Sweden.

The article only uses that term in the abstract, and doesn't mention anything related to LGBT elsewhere. Hard to take that claim seriously.

Must be a reference to this: