It's absolutely correct to say Twitter blamed their issues on Rails. It's less likely to be correct that they wouldn't need a similar major change if they had

It's absolutely correct to say Twitter blamed their issues on Rails. It's less likely to be correct that they wouldn't need a similar major change if they had started with anything else and grew from an MVP to one of the busiest sites in the world. I personally find it doubtful that they couldn't have done it with Rails.