You have video? "Starting" to take a 3rd step is not a catch. "Taking" a 3rd step is.
Please show me in the NFL Rules where the wrod "Starting" as you dramatically put in quotes to try and assert you authority over all matter of the rules is. Go ahead show me - show all of us.
This is the summary although I f you like I will happily produce the rule in its entirety for you. But guess what I read it and you'll have ans easy a time finding the difference between "Starting" and "Taking" a step as you do here.
Completing a Catch | NFL Football Operations
A player who makes a catch may advance the ball. A forward pass is complete (by the offense) or intercepted (by the defense) in the field of play, at the sideline, or in the end zone if a player, who is inbounds:
a. secures control of the ball in his hands or arms prior to the ball touching the ground; and
b. touches the ground inbounds with both feet or with any part of his body other than his hands; and
c. after (a) and (b) have been fulfilled, performs any act common to the game (e.g., tuck the ball away, extend it forward,
take an additional step, turn upfield, or avoid or ward off an opponent), or he maintains control of the ball long enough to do so.
So please show me where in the NFL Rules there is differentiation between starting to take a step and taking a step.