No player is eligible in the NCAA’s eyes as a result of DeWine’s order. It just tells Ohio schools that they shouldn’t uphold any rule prohibiting the fifth year players from playing. So I don’t see why the NCAA wouldn’t say immediately: if you play one of these players, you’ve forfeited the game.
Court orders are different because it’s a court issuing a restraining order on the NCAA to prohibit them from treating a player as ineligible.
It’s also worth noting that the NCAA has a rule (12.9.4.2 - the Rule of Restitution) which is designed for the case where a player is deemed eligible under a restraining order or injunction, which is later vacated or deemed unnecessary. It allows them to retroactively vacate wins, ban teams from the postseason, etc… Typically, courts have been including a section in their restraining orders also restraining the NCAA from applying it later since it’s expressly designed to have a chilling effect on how valuable restraining orders even are.