More interesting than the article itself (or the survey for that matter which certainly appears biased) are the comments.
My own theory behind this is because everyone who used to be a VB developer likely has DotNet on their desktop - whether or not they are USING it actively or just want to say they are using it to make it look good - remains to be seen.
I have DotNet. I have USED DotNet and if a survey asked me what tools do I develop in, I would certainly check off DotNet. But I don't work 100% in DotNet, which may be the real question that needs to be asked.
52% of application developers use .NET