Agreed. The time-line is not right. Hitler came to power in ‘33, became Fuhrer in ‘34. He did not begin rounding up future victims until the late ‘30’s.
I am supposing the owners of the art mentioned in the article were not clever or lucky enough to get out in '33. By '35 the US was no longer as accepting of Jewish refugees from Germany (thanks, FDR) and the Nazis had also tightened things up, deciding apparently it was preferable to isolate, humiliate, rob, and kill Jews rather than letting them leave.
The guy I'm talking about, by the way, was named Otto (I won't include the family name) and he changed it to Jack when, in a packed office in Manhattan three days after Pearl Harbor, the recruiting sergeant told him "there ain't no Otto's in the US Army". He later on was pushed through OCS, and became an intelligence officer with Third Army on Patton's staff. He had the photos to back up his story and at around 5'4" seeing one of him in line having his hand shaken by "Old Blood and Guts" at 6'4" is an image I will never forget.