I find navigating the LC site very difficult. At
https://www.larryco.com/bridge-articles/minor-openings I found my way to
"
In Competition
After an overcall, a cue-bid shows a limit-raise or better [example: 1? (1?) 2?]. A Jump-raise is weak [example: 1? (1?) 3?]. Notrump bids retain the same range as without an overcall.
After a Double, Redouble is 10+ and 1-level responses are forcing one-round.
A jump-raise after a double is weak, while 2NT shows a limit-raise.
"
That doesn't address it.
Further down we find
"For a complete LC Standard card and a prettier version of these articles, visit Bridge Winners"
I clicked on the BW link and it took me to BW but not specifically anything of LC. So I found LC articles on BW, all 58 of them. I haven't read them yet. I like LC well enough but I really have had trouble finding specific articles. So far I have not found where he adresses NFBs.
As to Wikipedia, they describe NFBs but they don't make any recommendation, they are not in the recommending business.
On to Pavlicek. It is much easier to navigate than LC.
http://www.rpbridge.net/7g19.htm#32If you go down to After a Suit Overcall we find that
A new suit at the 1 level shows 6+ highs and is forcing.
A new suit at the 2 level shows 9+ highs and is forcing.
So far he does not seem to be recommending NFBs
However, at the top he does say that this is obsolete as of Feb 2015. I have not yet found the updated system.
Off to play f2f. Today, with him, 2H is forcing. More later.