I am not an expert so I would highly recommend looking into more credible sources but my guess would be, since this is most likely not a very popular add-on, any browser with it would stand out considerably more relative to not having it.
Typically its common for browsers that want to reduce fingerprinting (tor, mullvad etc) recommend not installing new addons as then you stand out from crowd.
I’d say, since there are so many alternative ways to get this filter list, even if its a marginal increase in fingerprinting, its not worth installing it as an add-on.
I’m always skeptical when something is called privacy focused and the article lists no privacy features.
Does this actually provide any new unique privacy features or is it something akin to arkenfox where it is just getting everything upstream from firefox?