Utter BS
Same would happen in Italia, UK, Germany, France, Argentina, Brazil and any other country/league if best two or three strikers in the world (CR7 and Messi) play that league, specially when they play to powerful teams like Real Madrid and Barça who provide them more scoring opportunities than any other team
Compare the numbers they´ve achieved to win those trophies with any other country, they´d have won same trophies in any other country, beating any other local striker