yes, but it's the 25.7khz that's the kicker.
the cga/ega frequencies the convertor can handle are
14.5 - 16.5khz -which is cga
23.5 - 25.5khz -which is ega
30.5 - 32.5khz -which is vga
as you can see, the frequency falls just outside into the space between ega and vga
