It might be easier to visualise if you substitute money in for something more tangible. Let’s use water as an example; you might earn a one litre bottle of water for every hour you work. Your company then announces a pay rise accross the board; everyone in the company will now get twice as amny bottles! Sounds great, everyone’s on board, the company gets huge amounts of positive PR. You’re excited when it comes to pay day, just think what you’ll do with all that extra water! But when you get your pay you’re sorely dissapointed; while you did get twice as many bottles of water, each bottle is half the size. You may have got twice as many bottles but you got the exact same amount of water.
In this analogy bottles are currency, water is value. Twice as many bottles is meaningless if they’re half the size. You got a 0% raise.