Please read the stuff you’re referencing. It begins with “…the ITRS defines the 7 nm process as…” – if you click on the ITRS link you can read “As of 2017, ITRS is no longer being updated”. 2017!
Now the third and last time: your ’ 7 nm process’ article talks about TSMC’s N7 process. Now what TSMC itself (not the marketing department but those who actually do the work) have to say: ‘while we might like to think that the N7, N5, and N3 names it’s using for its 7nm, 5nm, and 3nm nodes relate to the gate length of transistors, they’re effectively just brand names.’
Who should we trust now? Some ‘enthusiasts’ writing stuff on Wikipedia (that gets copy&pasted by ‘tech journalists’, bloggers, Youtubers and so on) or the one who really knows?
Asides that Wikipedia in most areas is full of BS and this especially applies to semiconductor manufacturing where fanboys of AMD, Intel, Apple and whatever else do edit articles.
If TSMC for example presents a new process called N3 and a slide tells ‘up to 1.7 more density than N5’ then within no time some wiki clown will create out of this ‘up to’ marketing claim a static 1.7 multiplicator and multiplies some chip density BS number from the past with this new static factor and from then on Wikipedia claims ‘N5: 185 MTr/mm2’ but ‘N3: 314.73 MTr/mm2’ which is plain BS or just failed math combined with wrong assumptions and missing due diligence.
And everyone familiar with this technology knows this since different chip areas have different densities, for example ‘SRAM density is disclosed at only getting a 20% improvement’. Now compare this with Wikipedia where some copy&paste clown failing with math multiplied some also just vaguely estimated BS number for the N5 process with 1.7 to generate a new BS number for N3.
And always remember what TSMC’s VP of corporate research had to say at his Hot Chips keynote about these N3, N5 and N7 names: ‘they’re effectively just brand names’: