NVIDIA Developer interview questions

Got a mail regarding a telephonic interview. Was called on time questions were well built and in a hierarchical manner all related to the work they do. The interviewer was a senior software manager.

Not one single technical question. I was told they would not be making an offer because they did not think I could come up to speed fast enough. I'm not sure how the interviewer made that determination given there were no technical questions asked in the process. Can you say "bucking for an age discrimination lawsuit"?