Macron knows that he is telling a lie.
The story here is that Australia originally contracted France to build them diesel submarines.
France had delays and wasn’t in compliance with the contract so Australia canceled it for non-compliance and made a new contract with a US-UK joint venture to build them subs and this time nuclear powered (not nuclear weapons carrying).
France is of course pissed about losing the contract.
Shouldn’t he be happy they are moving away from fossil fuels.