Is it 8 metres though?
This is part of the issue: there's no clarity on any of this.
And if it was 8 metres is it shorter / longer than the distance between the stands on Goodison Road / Bullens Road / Gwladys Street and the houses / school / shops / pubs over the road from those stands? Because that's what Everton match-goers are used to right now and it'll be a massive culture shock to not even have that space.
Gwladys Street has an accessible depth of just under 8m, that's from Facade to garden walls (Map length, ground length takes into account kerb depths). Not 100% accurate, but probably give or take 250mm considering altitude and perspective.
However, based upon the design drawings, the sections show a BMD North Stand accessible width of 9.4m (9477mm) at the point of the section.
This section isn't however the narrowest point, that is the end towards the fan plaza. I have calibrated the measure tool based upon these section values and the point of section, and measured the narrowest point to be 8.8m (8818mm), so still near a whole meter larger than the space currently available at Goodison
It is also worth considering that at BMD, a large proportion of the fans will exit the building outside of this narrow area, due to the placement of the turnstiles, where they will be expelled directly onto the fan plaza.