Thomas Cook aren't being upfront on their own accord, they are legally required to tell you.
Does it matter, not to me but lets at least be aware of the facts.
It's at least as relevant as stating that TCX use a
Lithuanian A320... Just off lease to Cambodia
or
if you choose to fly TOM, you could well be landed with a 20 year old Slovak 737 400...
How is that relevant? After all...
All airlines have to abide by the same laws and meet the same standards.