My guess is that the seller can't (or won't) convert metres & centimetres to hands. If you read the body of the ad, you will see that the horses' heights are given in metres.
Look like some of the pics are of horses in Spain. I would say those ones are all for sale in Andalucia (so they're Andalusian!!) Some of them look PRE, others just look like pretty standard horses. Perhaps the advertiser is just bulk advertising horses that are available but not in their possession?