It sounds like the article is about the (proper noun) Long Term Stock Exchange, and whether or not it will make a difference. I tend to think of problems like that in the context of first asking "what is the Long Term Stock Exchange?" At the moment, at best it's a marketing ploy that advertises emphasis on long-termism, but without any approvals to do anything that they think supports long-termism. And the ideas they want to implement don't look feasible from a legal perspective. So, knowing these things, will it make a difference?

This is just not true, at least in the sense that the LTSE is trying to use the term 'tenure voting'.

Right now, every share of a particular security is equally fungible. When Person A sells security X to Person B, the security does not change. Dual class shares are a way to hack around accomplishing something similar to tenure voting, but that hack is that they issue two different types of securities (which, of note, companies have been issuing many types of securities for a long time), but for that security to trade on a listed exchange, it cannot be selectively prejudicial about who owns it. It's the same security with the same rights.