Connect to just one node per /16 block

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While setting up certain things I got PM stating that:

"Keep in mind that Bitcoin/Litecoin/etc. are made to only connect to one node per /16 block, so if his computers are all in the same /16 network (IP 1.2.*.*) those three nodes
will effectively not be utilized to their fullest extent."

Afterwards I connected to three /16 block IPs successfuly with connect=IP but that is also the case with addnode=IP so my question is - rule as quoted above is false or it is
just the code used with altcoin I'm doing setup with (it is based on Bitcoin code) is outdated or modified in regard to quoted rule? Or it is just addnode=IP is ignoring quoted rule?

All three IPs are in 192.3.*.* range.

[subSTRATA]

Solved, addnode=IP overrides /16 block rule.