both sides are at fault here (the "journalist" and Bitvise - the PuTTY maintainers have nothing to do with this).
the Bitvise owner shouldn't have responded so unprofessionally, and their views on open source software are strange - but they're correct that the domain was never "historically associated with PuTTY", it just uses its name.
additionally, the usage of unformatted markdown in each "journalist" email makes me think this story was at least partially assisted by an LLM (https://putty.org/20250713-MiraiF-Emails.txt)
in short this is a nothing story