The video is from 2015 and doesn't age very well. I'd like to hear his thoughts now.
1. Rubbish, lol. United always had big support in terms of numbers, home and away, even in the days they were shit. But the atmosphere at Old Trafford is simply not a leading factor. They suffer from the same support as at other leading PL clubs and football tourism. In terms of global fan base they have the largest support, if you believe their numbers. This comes from being the most successful team when the PL exploded as a global product.
2. "No one can touch us" in terms of revenue. At the time they might have been 1st(?) but they are 3rd now, and are definitely "touched" by at least Barcelona and Real Madrid.
3. Still relevant - United had three good eras in their entire history 1) post war to mid 50s, which was unfortunately cut short by the Munich air disaster, 3 titles in 12 years, 2) Mid to late 60s with George Best, Denis Law etc when they won titles and their first European Cup, then 26 years later until they won a league title again (were relegated and won 5 other trophies in that time), Fergie arrived in 1986 and it was 7 years before he won the title, so 3) from 1992 until 2013 when Fergie retired they were as dominant as I've seen a domestic club side. United's current standing is certainly built on SAF's 26 years at the club.
4. Scousers are 1 league title behind and 3 European Cups ahead, United have 5 FA Cups more. There is nothing in this, that bragging right has now gone.
5. Signing top players? Hmm, not any more. They've signed one "top player" since Fergie left and that is Pogba, a guy who has a connection with the club. The rest of their signings have been either second or expensive third tier signings, and so many flops.