Its 100% related. Luke's Bitcoin Knots lowered its limit on OP_RETURN in order to ignore transactions he considers "spam", which is what you think ordinals transactions are, so what's the difference?
The exploit Ordinals Attackers are using is not related to OP_RETURN and if it did we would have never had this problem to begin with because:
- OP_RETURN is part of the protocol that everyone has agreed with. Ordinals is not part of the protocol and only scammers like it.
- using OP_RETURN is not an "exploit" while what they call Ordinals is using an exploit in the protocol, an oversight by the developers introducing SegWit
- most importantly OP_RETURN has a limit on how much arbitrary data you can push to the chain while the exploit Ordinals attack is using has virtually no limit
- even more importantly OP_RETURN does not create UTXO bloat since said outputs are provably unspendeable while Ordinals attack will create dust outputs that can not be spent nor be pruned.