All Lives Matter suspension in Canada

Tenor Remigio Pereira was recently suspended from The Tenors of Canada for singing, "all lives matter," changing the words of "O Canada" at an MLB game. Not clear to me if they thought it was disrespectful to their national anthem or to blacks. But I fear it is now racist to claim all lives matter. Is it disrespectful to mention baritones and basses also count if a group is named THE TENORS? https://www.youtube.com/watch?v=bpxsJ-_vdPU