This is not an uncommon move and it's done every season. In 2018 when the Toronto Marlies won the Calder Cup,
Travis Dermott and
Kasperi Kapanen were both sent to the Marlies in order to be eligible for the playoffs. Kapanen, who had significant NHL experience at the time, didn't go to the Marlies after the Leafs lost to the Boston Bruins in round 7. Dermott joined the Marlies for their playoff run and played a key role in their Calder Cup victory.