It would appear that this Orthodox Church is not really orthodox.
“Vagante” is the magic word.
These happen when a renegade Catholic or Orthodox bishop consecrates a bishop without approval or agreement of the church, or a properly consecrated bishop goes rogue and heads out on his own and starts concentrating more bishops.
You get oddities such as this, which still use “orthodox”, “catholic”, or more often both in their names.
This group is no more “Orthodox” than the Liberal Catholic Church, or the laicized priest who purported to ordain his wife in the garage, are “Catholic.”
Edited to add: For future reference, these are all of the recognized Orthodox Churches:
Note, though, that some of these were previously
not canonical, but eventually got recognized, and (roughly) achieved retroactive canonicity.
And on the other hand, the Orthodox Church in the Ukraine, from which the Russian Orthodox and all other slavic orthodox descend, is now known as “the Ukrainian Catholic Church”, while the Ukrainian church on your list was established in in its territory after the “Falle Synod of Lviv” (which purported to hold a synod ratifying its absorption by the ROC while priests, not bishops, voted under the guns of the Soviet NVKD, which had imprisoned all of the bishops and non collaborating priests). There is yet another Orthodox Church in the Ukraine recognized by the EP and not the MP . . .
That said, there are the canonical Orthodox and the splinter/national churches which are splintered only on national lines and will presumably some day either become canonical or be reabsorbed, and there are the renegade vagante such as this Celtic group,.
If you want to learn more about vagantes, and have a couple of days to read, search
There are a couple of people there that actually track vagante as a hobby.