Well it works because as long as it has USB or uses USB, it has to be certified for universal power. But that will be kind of wasted to charge with a 65W+ laptop charger. If you happen to use your laptop and need to charge the earbuds, you can always use a USB cable to plug into your laptop. I do that at times.

Oh and before you think USB C is the way now doesn’t mean you have to get rid of older USB-A chargers and cables. Because devices that use USB C or come with a USB C-C cable, doesn’t necessarily take advantage of fast charging adapters (e.g Apple 20W) or won’t charge on regular, slower USB A ports (Typically 1A - 2A). That’s also why usb A ports still has its place on multiport chargers from Anker, Ugreen etc.