Yup, it does make it that much more tragic. Thing is, he still sounds all right in his part of the song (for some reason, his voice sounds a little weaker in You Don't Fool Me, but maybe that's just because Mother Love is sung at a lower pitch) but then apparently he just can't manage to force it out of himself at all. He worked as hard as he possibly could to get out as much material as possible, and then eventually had to just give up on it. Freddie Mercury not able to sing? Blasphemy! And then, at the end of Freddie's last ever vocal recording, it essentially goes through his entire life backward. It's beautiful.
Welcome to Queenzone! You should get used to us soon enough.
These are the days of our lives
They've flown in the swiftness of time.