Swapped to my alt account on feddit.de and subscribed to the community.
I can see the post and hopefully you can see this reply.
However as of 30min after this thread was created I can only see the reply from a lemmy.world user, not the others.
Maybe me subscribing to the community will help federation. But feddit.de has occasional issues in general.
Edit: the fanatics.social reply also shows now
Edit2: a few more newer ones starting to show up, so I assume federation is slowly happening?
Edit3: older comments from other instances are also starting to show up.
Seeing yours too (from both feddit.de and lemm.ee).
For me older replies are slowly starting to show up too, so I guess either posting or subscribing to this community started federation and it just takes time to catch up