As explained above, this particular exploit only remains in memory until you reboot the device. Unless you visit the site again after the reboot, no trace of it

As explained above, this particular exploit only remains in memory until you reboot the device. Unless you visit the site again after the reboot, no trace of it would be left on your phone. If it was indeed this exploit, they had your data at that point already though. No action will undo that, but changing secrets might help.