SO, im from poland, and this woman speaking "wu" but in polish language is only "w". If u speaking alphabet you can say "wu". Sorry for my bad english :p
program czytający , w zwolnionym tempie czyta każde słowo osobno, więc czyta "w" jako "wu"
Text to Speech in slow speed reads every word separately, that is why it reads w as "wu", even though , we only use it when speaking alphabet, or spelling.