So what I don't get is how only a tiny minority running knots 29.3 will enforce BIP-110 to the majority of nodes running core and not enforcing BIP-110? Why miners will follow the rules of a few nodes running BIP-110? And not the rules of core nodes not enforcing BIP-110?

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Its 16+% of the network, not just a few nodes and beside that ALL Bitcoin nodes at this point ACCEPT BIP-110 blocks.
I don't get why and how all bitcoin nodes accept BIP-110. So after the possible activation, core+30 with op_return with that big limit will split the network?