"the Schengen Zone", relates to official, approved, "Free Movement". It has no effect what-so-ever, on unofficial, uncontrolled, movement of illegal migrants.
. . . . It was/is understood, that large swathes of "the Schengen Zone", had -anyway- already been suspended because of COVID ?!
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It is suggested that you are more than generous in appropriating a degree of logical thinking to the French, that
now - AFTER A NUMBER OF YEARS - they belatedly have been able to deduce the "cause & effect" influence of the supposed benefits of travelling to the UK

!!
The same question is repeated . . . once the illegals are in France, WHAT is the incentive to the French, to prohibit, delay, obstruct, the daft buggers “setting-sail” for the UK in their inadequate, unsafe, inflatables ?!