I also didn't attend the perspective visit last year but still got accepted to the program I'm currently in. I later found out I was the only applicant who didn't visit in person but had a Zoom interview instead. So it won't be a fundamental flaw as long as you do well in the interview, I guess? (But in my case, I was directly asked for a Zoom interview without being invited to a perspective weekend, so it's slightly different from your situation.)