You only resolve that kind of badness by firing a bunch of SVPs and VPs and Gelsinger hasn't done that, for many possible reasons.
He might be right but that youtuber has a poor track record. He's just constantly pushing out rumours for the sake of content farming. Some of the rumours are right, some are wrong as hell.
PS: Microsoft demoting Jeffrey Snover (inventor of PowerShell) is in the same category of a business decaying from the top down. He quit too, and is now working for Google.
If it takes that long, then this is your actual problem, and not how many engineers are in the loop at the board level.
Most IC design life cycle are 5+ years. Expecting to turn over in less is part of the problem intel is having currently.
No engineers or support people, but just pure middle managers - fire 2 or 3 layers. if they did that 3 years ago, they would be in a better position now.