My God, I can't believe we're arguing this now...The toe came down in bounds before the heel went down. A still shot don't show it all.
A player is out of bounds if any body part is touching a sideline, end line, or anything, other than another player or a game official, that is on or beyond a sideline or end line.
https://cfo.arbitersports.com/Groups/104777/Library/files/2014 Plays inbounds outofbounds.pdf