According to PWInsider.com, WWE's original plans for Hornswoggle at Greatest Royal Rumble did not include him participating in the 50-man Rumble Match.
The former WWE Cruiserweight Champion was originally slated to compete against a fellow little person by the name of Robbie Araujo, who was flown in for the event, but the match was scrapped for whatever reason.
If you reference any quotes from this piece, please attribute them to the original source, and kindly credit WrestlingNewsSource.com (h/t) for the transcription.