It’s not happening. The company had to make a statement after the dailymail posted it’s bullshit the other day. Daily Mail had to publish a follow-up about it:

https://www.dailymail.co.uk/travel/article-14742311/Standing-seats-designer-comfort-tested.html

It’s still bull. This has been resurfacing routinely for years.

The Daily Mail had to post a followup to their own bullshit, where the designers states plainly that these are prototypes and not being used anywhere any time soon.

https://www.dailymail.co.uk/travel/article-14742311/Standing-seats-designer-comfort-tested.html