"English players" in this context = England internationals or, if uncapped, players who have declared for England, played for England youth sides and no senior international team, or were born in England. So, other countries' internationals who were born in England – e.g. Wes Morgan of Jamaica – do not count.
Premier League STARTS only, not substitute appearances, because even Chelsea fans might struggle to name the kids they brought on at the end of the season.
In order to create a playlist on Sporcle, you need to verify the email address you used during registration. Go to your Sporcle Settings to finish the process.