Thanks for the example, although those webpage doesn't mention anything about disabling Intel ME.
Particularly if the computer is airgapped then there is nothing to worry about.
But I don't see the IME having the throughput to divert 100Mbps block and transaction traffic from a full node to it's own little MINIX drivers.
Not the OP's case already. They don't plan to have an airgapped computer at all.
Note that the OP's objectives for that machine are also "store bitcoin, earn bitcoin, spend bitcoin, Bisq to buy Bitcoin and Lightning network software. ".
In addition, there's history Intel ME exploited to bypass firewall. See
https://www.bleepingcomputer.com/news/security/malware-uses-obscure-intel-cpu-feature-to-steal-data-and-avoid-firewalls/.