I tried the link for Diarmuid O Suilleabháín and got the message "this video is unavailable. Sorry about that."

words in Irish and a few translations can be found in the first associated thread in the links at the top ot the page; I didnt go any further to check out the others

I did find other recordings of "Tá mé sínte ar do thuama" on youtube, for instance Mairéad Mhic Dhonncha
(táim = tá mé = I am; in Celtic languages the verb comes before the noun)

I did a search for Diarmuid O Suilleabháin on youtube and got a link that works for me https://www.youtube.com/watch?v=qBzMFUo8JU0

in English, Philip King's group Scullion also a youtube video