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Yes, AFAIU (not an expert), iptables and nftables are two command line tools and abstractions (chains vs. tables) for interacting with the same underlying netfilter API.

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I believe at one time they were two separate subsystems, but they got merged in 4.x or 5.x

I run 6.3 and the incriminated files were not compiled in my kernel thanks to CONFIG_NF_TABLES=n during make config.

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