Context on Tryndamere current PBE change ?

I wanted to know what motivate the Tryndamere change on the PBE.

Also, knowing he gain 0.35 AD for each 1% health he's missing, having 70 health instead of 1 at level 16 makes him lose ~ 1 AD, near 3 damages per critical strike with an Infinity edge, will this be looked at ?

[EDIT] WIll this also replace the actual end of ultimate healing as well ?

Thanks for reading and answering,

Kyunsei

Sorry if this post is in the wrong place