I think nobody in the EU can make such assurances. It's a law, and courts will decide if apple is following them.
The European Commission announced a few days ago that they will look into the decision of apple to remove PWAs, so they more or less announced they are trying to fine them because of it.
Which means that completely removing PWAs could be the more risky choice instead of keeping them Safari-only. Completely removing PWAs already started an investigation. Keeping them Safari-only might not start an investigation at all, so it might be the lower risk.
After all I think Android also has a Chrome-only implementation for PWAs, exactly like Windows, that runs PWAs on Edge. Also back in the days when Microsoft had to give users a choice to use another browser than Internet Explorer it was also not possible to exchange Internet Explorer as the engine for many system services that used the system web view component. I think it's still the case with the current Windiws WebView2 based on Edge.
The European Commission announced a few days ago that they will look into the decision of apple to remove PWAs, so they more or less announced they are trying to fine them because of it.
Which means that completely removing PWAs could be the more risky choice instead of keeping them Safari-only. Completely removing PWAs already started an investigation. Keeping them Safari-only might not start an investigation at all, so it might be the lower risk.
After all I think Android also has a Chrome-only implementation for PWAs, exactly like Windows, that runs PWAs on Edge. Also back in the days when Microsoft had to give users a choice to use another browser than Internet Explorer it was also not possible to exchange Internet Explorer as the engine for many system services that used the system web view component. I think it's still the case with the current Windiws WebView2 based on Edge.