Yes, he sadly is absolutely legit. Well, not or at all legit… But yes, he is a genuine ordained permanent deacon of the Diocese of Lancaster and even holds the bishop’s mandatum as an approved Catholic theology teacher. He helped to establish the School of the Annunciation at Buckfast Abbey and has designed catechesis programmes for several dioceses.
His bishop and that bishop’s predecessor have tried to shut down his social media activities. At one point I believe he had his wife running his social media to circumvent a request from his bishop to desist. This was all reported in the media in the UK at the time and got quite a bit of attention as it coincided with a visit by Pope Benedict XVI. He occasionally softens his stance, e.g. at one time his Twitter profile said “Catholic, not Bergoglian”, but that was changed to something less obviously subversive. My guess is that he temporarily behaves himself after a talking to from the bishop and then resumes when he thinks the bishop isn’t looking.