Yes, true, and there are other groups too. I was trying to keep the subject as simple as I could. Apostolic succession lines outside of union with Rome, or even canonical Orthodoxy (ex-SCOBA), get extremely complicated.Also notable: Polish National Catholic Church.
And then you get into proper form and intention. Can someone who consecrates an occultist, theosophist, or (God forbid!) a satanist, be assumed to “do what the Church does” (facere quod facit ecclesia)? And what formula did they use? Sacraments are either valid or they are not — no middle ground.