You are aware that I'm referring to slick racing tyres, where rot isn't the slightest bit of concern. Having said that, I work with 30 - 80 year old cars, and have not seen rot being a major problem yet, except in tyres we've stored outside for about 20 years un-mounted and open the elements.
We don't change our pressures much - I leave my road car pressures alone, and we don't tweak race pressures much either - on a trackday we won't change cold pressures at all.
No idea about Chris Timms, but I'd suspect not. (who is Chris Timms?)