Maybe because he's a mixed race English midfielder?
If you have't seen any stats or facts here are a couple of comparisons:
Jack Rodwell played a career total of 3 England caps.
Kalvin Phillips is 26 and started every game (7) on route to the European Championship final. Total caps at 26: 23.
Jack Rodwell never recieved an individual award.
Kalvin Phillips was in the Championship team of the year in both 2019 and 2020 and won England player of the year in 2021.
Jack Rodwell had just come off a season where he played 17 games in all competitions.
Kalvin Phillips has just come off his worst injury hit season and played 23 games.
Jack Rodwell was a budget option bought under the shadow of (the newly formed) FFP and as a cheap backup player to essentially replace Owen Hargreaves, a man who played just 4 times for the club.
Kalvin Phillips has been selected, in a window in which we have so much freedom, as a first choice target to replace Fernandinho, a club legend with 33 appearances last season at the age of 37.