21st round Hilton Dyar's coach tweets that Dyar is going to sign. (Dyar apparently goes by "Dallas," notwithstanding what MLB has as his given name.)
[h/t to Matt Winkleman for finding this tweet.]
Searching on the revised name... from the Biloxi Sun Herald:
As for the three signees who were set to join the team [Southern Mississippi] for 2020, one player has decided to go pro — Clinton High School right-hander Dallas Dyar, who was picked in the 21st round by the Philadelphia Phillies.