I take issue with the article’s assertion that it’s a “sneaky payrise” as if it’s somehow dishonest.
I’ve done this before after accumulating several years worth of leave due to a previous employer having strange ideas about project management and the mythical man-month.
I suppose I was kind of pressured into it, but I also liked having a pseudo-bonus that year.
From memory, I believe one government increased legal minimum annual leave from 3 to 4 weeks, then the following government changed it so you still got the 4th week but you could cash it in on agreement with your employer. So you can’t cash it all in, just 1/4 per year.