This still doesn’t get your website validated. Twitter for some reason expects the meta tags to be in your header 24/7.
I for one don’t like a header that is full of meta tags etc that are only used once when you share you post so Twitter / Facebook / Google can get those meta tags and get valid markup.
I have build a simple function for wordpress that only adds the meta tags when Twitter/Facebook/Google make a request with one of their user agents.
Twitter’s Card Validator gives me a 100% valid result when checking my links (making a request to my website/post) how ever when ever I apply to get validated twitter sends me an email telling me the meta tags are missing, in my eyes this tells me twitter doesn’t use it’s own card validator to validate website/pages.