It is perfectly related, as for the last 10 months or so, protopresbyter Heers has been promoting
1) Theories about the Zionists, Kabbalah, Masonists being behind the corona virus with the plan of seating the Anti-Christ as the world ruler, with the crisis being just the shortcut to bring people to submission
2) Asserting a novel doctrine of the temple area as a total-illness free zone (even in regard to person-to-person infection) as dogma (consequently, those who employ or agree with sanitary measures are heretics, blasphemers or at best in grave error)
3) Promoting "holy disobedience" to the bishops in regard to the sanitary measures
4) Taking a very political stance pro-Trump, despite his clerical rank, and spreading conspiracy theories about the election having been stolen.
5) Exhorting the Orthodox to not take take the COVID-19 vaccine and spreading theories about it being the Mark of the beast or a "precursor".
In short, he falls under each and every category of issues Met. Joseph discusses in his letter and in no uncertain terms, condemns. Now, Heers obviously isn't under his jurisdiction (good for him, he would be suspended or even defrocked at this point.) In fact, it seems he is under no-ones active pastoral oversight as he says he is under a ROCOR-USA bishop while residing permanently in Greece.