Is all of Cornwall for sale?

One of my own photos from a Christmas display in a Bristol estate agents.

Having been amazed at the increase in the number of properties available within 20 miles of Truro 10 days ago there seems to have been an even more remarkable increase over Christmas - don't these estate agents ever sleep? Now on rightmove their search claims that there are 899 properties for sale within just 5 miles of Truro! I got bored looking for the end number on the within 20 miles of Truro search - last time it had come up with 236 not over 900!

Can everyone's before-Christmas sale have fallen through? Could there really have been that many in the pipeline? Is the whole of Cornwall for sale?

Or has rightmove changed its algorithm for nearness?

Or have some of the agents tried to expand the areas in which their properties appear - this is actually what I think is happening...

As a check for future searches here are some numbers of properties available at specific locations, on rightmove, using "this area only", no minimums or maximum, all types:

Bodmin - 220
Boscastle - 23
Bude - 132
Cadgwith - 66
Coverack - 4
Falmouth - 344
Fowey - 58
Hayle - 142
Helford - 3
Lamorna - 3
Lamorna Valley - 71
Liskeard - 184
Lizard - 66
Marazion -32
Newquay - 486
Padstow - 62
Penzance - 328
Perranporth - 78
Polperro - 30
Porthcurno - 71
Rock - 11
Saltash - 160
Sennen - 13
Sennen Cove - 0
St Agnes - 41
St Austell - 387
St Ives - 221
St Just - 50
St Mawes - 30
Tintagel - 34
Truro - 297
Wadebridge - 98