Because the lineman who was hit by the ball during this play was not beyond the line of scrimmage.
As Eagles lineman #63 was behind the line of scrimmage when hit by the ball, then Article 9-2-1 (Touching Behind the Line) would apply which legalizes contacting a kicked ball before it crosses the line of scrimmage.
NFL Rule 9-2-1:
TOUCHING BEHIND THE LINE.
Any touching of the ball behind the line of scrimmage by a kicking team player
is legal, even if the ball has crossed the line and returns behind the line.
A first touching penalty would only apply if the kicking team player who makes contact with the ball is beyond the line of scrimmage in accordance with the NFL Rulebook Article 9-2-2. (First Touching Beyond the Line):
ARTICLE 2. FIRST TOUCHING BEYOND THE LINE. “First touching” is when a player of the kicking team touches a
scrimmage kick that is beyond the line of scrimmage before it has been touched by a player of the receiving team beyond the
line. If the ball is first touched by a player of the kicking team, it remains in play. First touching is a violation, and the receivers
shall have the option of taking possession of the ball at the spot of first touching, provided no penalty is accepted on the play,
or at the spot where the ball is dead. First touching does not offset a foul by the receivers; if there is a foul by the receivers that
is enforced, either before or after the first touching violation, the violation is disregarded, and the penalty is enforced as
customary.
