There may be people who believe that, but I don't think many of them are theatre historians. Edward Albee denied it whenever asked. His work collectively reveals an effort to make sense of the puzzle that was his own life, which involved understanding how and why he was wired as he was. His mother, his aunt and many women played a role in this. His characters, beginning with Martha, would not have had the appeal to actresses they have had for the past sixty years had they not been rooted in this search.
He was not a compromiser. He would have written about four gay men if he'd wanted to.