I guess the problem is that the Venn diagram of 'people who have the experience and currency to display vintage Jets' and 'people who can afford to fly vintage jets' doesn't have much in the overlap. This chap appears to have been in the latter category but not the former. I only fly spamcans and I wouldn't be happy with that level of currency in a PA28.
Also I note the falling off in his annual hours recently - I wonder if family considerations meant he couldn't find time or money as easily? Pure speculation but a common problem with private flying.