As it is written in the article:"Prince Francisco of Spain is said to be the direct descendant of German and Spanish royalty and has lived in castles for most of his life."
Firstly-he is not Prince of Spain

Secondly-it could be Don Francesco de Bourbon y Hardenberg,son of Francisco de Bourbon,Duke of Sevilla and Countess Beatrix von Hardenberg,daughter of Princess Maria Josepha zu Fürstenberg which would make reasonable newspaper writings about his ancestry...
Thirdly-I have seen some older pictures of Don Francisco and he did look a bit slimmer,so I am not 100 % sure if this is him indeed,but seems likely...