I though my reply (which was basically: "faaaak off!") was succincter.Ok, we covered this previously during the Euros. That's simply not true.
With regards to win percentages excluding caretaker managers like Carsley or single game managers like Allardyce, the top 6 are as follows.
Capello 66.7% (28 wins in 42 games)
Southgate 62.7% (64 wins in 102 games)
Ramsey 61.1% (69 wins in 113 games)
Hoddle 60.7% (17 wins in 28 games)
Greenwood 60.0% (33 wins in 55 games)
Eriksson 59.7% (40 wins in 67 games)
With the 2 previous foreign managers in 1st and 6th, you might have to do a bit more convincing here with an argument based on nationality alone.
https://en.wikipedia.org/wiki/England_national_football_team_manager