Hi Chris..yes I know that transceiver tower from my days living over in the Gers..
As the lowness.. they can be interestingly low, I didn’t dash into look at Flight radar when our friendly BelugaXL did it’s dirty flypast last week (bit busy with DIY) but he appeared to be down at around 5000 feet or significantly less, well into GA (including the area used sometimes used by parachute dropping aircraft that are climbing out from Pamiers-Pujols), helicopter and military fast jet territory. It’s not infrequent to see some of Airbus stuff down at these levels, it certainly was quite common during the early flight testing of the 380 and the 350, hence the question. FWIW most of the more routine stuff (? Pre-delivery) appears to be done over us, but at higher levels.
BTW just to clarify the area they use isn't in the Blagnac overhead - if you have a look at the area south of Toulouse on the map and imagine a very long east'ish west'ish race track running roughly overhead the likes of Saverdun to the south east of Toulouse you'll get the idea.
And finally just to emphasise I’m not for one moment claiming there is anything cavalier or odd going on, it's great to watch, but simply interested to know what if any service they do get.
(Edit to add:, F-WBXL is at it again this PM, Tuesday, just gone overhead'ish yet again, this time at 1425 local, third time this PM - it's at 9000 feet on a race track between Limoux (east) and l'Isle en Dodon (west))