I was in the process of downloading a few of these, and now indeed the channel is gone. I only managed to download one hymn. 

Lemme guess, some agent flagged the Veni Creator Spiritus for © infringement (∵ it sounded like their own ©ed recording of it). That happened to me. 🤦‍♂️
Such hymns are clearly in the public domain.

There was a playlist on the SSPX News - English channel with the hymns but it seems they were all removed....

Does anyone know if the hymns can be accessed anywhere else? I liked the Pange Lingua version they had better than any other I’ve heard.

St. Simon. pray for us. 
Here is a French Sspx Youtube Pange lingua. Personally, I listened to it at .75 speed. Great polyphonic verses. Give me more titles that disappeared and I will try to find something in French...Oh! I mean LATIN..
My good friend Roger pressure washed that entire church, about 1988. Drove a big pumper truck via front entrance, boom for 35' ceiling. Even worked on a Sunday, started the rig 1 minute after High Mass.!  With Fr.'s blessing of course. Roger said up there under the stone dome, you could clearly hear whispers, such was the acoustic perfection. Our forefathers were skilled and devoted. 
Sing my tongue...