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They wouldn't be the only ones guilty of it
https://www.emirates.com/media-centre/emirates-statement-on-operations-at-london-heathrow/"The bottomline is, the LHR management team are cavalier about travellers and their airline customers. All the signals of a strong travel rebound were there, and for months, Emirates has been publicly vocal about the matter. We planned ahead to get to a state of readiness to serve customers and travel demand, including rehiring and training 1,000 A380 pilots in the past year.
LHR chose not to act, not to plan, not to invest. Now faced with an “airmageddon” situation due to their incompetence and non-action, they are pushing the entire burden – of costs and the scramble to sort the mess - to airlines and travellers"
The accusation is, I believe, that the French haven't scaled up their side to cope with the massive start of the holiday rush. Obviously Brexit's fault, but entirely possible that the French aren't bending over backwards to do all they can to alleviate things.