I'm afraid you're spitting in the wind with this one.

This is a newsgroup on UseNet - the Wild West of the internet
and this newsgroup is Unmoderated - which means anyone can
post anything (as long as it's just "text" as opposed to "binaries"
which permit posting image files), There is no easy way to filter
out "spam".

Since you appear to be new to UseNet, be aware that in addition
to posts for products and services not related to the usenet
newsgroup's focus, you'll also see "phishing/fishing" messages
that are intended to provoke responses - from which e-mail
addresses can be gathered - or "points earned based on the
number of responses".

Your best bet is to just ignore messages that don't interest
you. These things come and go. This one will go away in a while.