"Free" has about 10+ meanings just to give a bit of quick scope and more deeper dive below...

"Free" has almost too many meanings possible, so makes it less useful / too general as a multi-used word and increases chances of misinterpretation with it's broadness and commonality.

One meaning of "free" may include freedom but that is also ambiguous since humans on some level are bound or tied to many things in life so it's hard to know which is inferred.
Saying "Free Software" help but could also mean Free Price more than "Liberty to do as you wish with the software".

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SMALL TANGENT - RESUMES AFTER
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CAN WE REALLY BE MORE FREE IF YOU AND I WANTED?
In many ways humans are never truly free but this is just for those that might argue free or liberty doesn't exist but it certainly does since you or I individually or groups of people can limit or diminish freedoms / liberty ourselves physically or through software with conditional forces.

For example, it could be Mankind's endevour to make Freedom a priority rather than Mass Profits or Prostituting life for money. the focus could be to give / love , but it's more sell / extract.

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RESUMING (AFTER TANGENT)...
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Saying "Free Software" helps but still can be ambiguous or depend on the context and education of the reader... so again relying on chance quite a bit...

Saying "Libre" has the added benefit of:
1 - sounding and said in foreign way and thus being more signifiant in the sentence
- and as uncommon word becomes more likely questioned and less assumed to what it, especially if unaware. (With "free" you can easily assume you know and assign it a meaning incorrectly to what someone says, without the nuance of liberty as the end goal. But saying Libre you can't get away with that)

Libre makes it sound like Libertie in French (English is a mix of French, German and many others!) so makes sense also for those that learned French (100% a mandatory 2nd language in all English secondary / high schools for at least 2 years)

"Free software is a matter of liberty, not price."
https://en.wikipedia.org/wiki/Free_software#cite_ref-free-sw_22-1

#Libre vs #Free #Terminology
Mixed #Languages #English #French #German etc !

Credit:
Pic 1 - LibreWolf (Browser)
Pic 2 - LibrePlanet (Video content etc)
Pic 3 - Chip picture from @libreleah