To add to xxx
I’m a Shimano fan boi. And have bled the brakes MANY times in last 5+ years of doing it myself. Watch a good video , both kits online the knockoffs on Amazon and the legit one work, but the new hoses in the Shimano kits have a metal fitting that hooks into the nipple and it’s actually really nice, stops the tubing from coming off much less faffing.
Having said that, these new Shimano brakes do pretty well with the gravity bleed as seen on the syndicate YouTube video:
https://m.youtube.com/watch?v=piWBVDh1pTE
IFFF, you remember to move the caliper around a bunch and finish with the nipple port up above level. That’s how I’ve had my best results with the new x120 series that have been out for last whatever. Occasionally I have to do the caliper purge seen at the end of most videos (but not in the syndicate one) but not all the time.