MIAMI — Leonardo González Dellán’s LinkedIn page promotes him as an entrepreneur and restaurateur. A 2019 U.S. Treasury Department sanctions notice called him something else: testaferro, a financial “frontman” hiding money for corrupt Venezuelan politicians. To South Florida resident Alejandro Andrade, Venezuela’s treasurer during the Hugo Chávez presidency, he was an alleged enabler — a conduit for moving stolen money to the Alpine nation cherished by swindlers for its secrecy. But to global financial giant Credit Suisse, González Dellán went by another moniker: client. A leak of documents fr…