After reading the article (and others), I think this is giving him too much credit.
He was the BBC studio controller at the time and pushed to have the matches broadcast in colour. The BBC ignored him for years and then suddenly changed their minds without reason, and in 1967 they ordered David Attenborough to do the next Wimbledon in colour.
However, the colour of the ball wasn’t changed. Balls remained white even while being broadcast in colour.
Yellow balls had actually already been used since the 19th century, but not consistently, and not at Wimbledon. After a few years of tennis matches being broadcast in colour, the ITF (without David Attenborough’s involvement) conducted a study and found that flourescent yellow balls were easiest for viewers to watch, and so they started being used at Wimbledon starting in 1972.
It is, but it probably shouldn’t be any more. WebP has good support everywhere now and is slightly better than JPEG and PNG combined. (Better lossy compression than JPEG, plus transparency support, and better lossless compression than PNG). But even WebP is considered lame these days compared to the new crop.
E.g., JXL (JPEG XL) is much better WebP and is supported by everyone except Google (which is ironic since Google helped create it). Google seems to want AVIF to be the winner for the new image format, but not many others do.
Anyway, until the Google JXL AVIF hissy fit is dealt with, at least we’ve still got WebP. It’s not super great, but it’s at least better than JPEG and PNG. A lot of web developers are stuck in their old JPEG PNG mindset and are being slow to adapt, so JPEG is still hanging around.