The wiki for caravan_site says:

==
They may also have some space for tents. If a site is primarily for tents, it should be tagged as tourism=camp_site. If tents are allowed on a site it should be tagged with tents=yes. 
==

And the site is tagged with tents=yes.

It is operated by https://www.campingcarpark.com/fr_FR/
Which on it website presents itself as:

"CAMPING-CAR PARK, the 1st European network of stopover sites and services areas"

On the website it says that it is open for motorhomes all year, and can take tents and caravans in the high season.

On the aerial images I can see only motorhomes  

So I am sure that  it is a caravan_site. 