Not saying it's an issue but he does specifically mention there could be extra coding using DSG with manual
Selecting the Parts Needed
Also to consider is the buttons are lit up red on T6s and Polos whereas Golfs are white. If you have a DSG then flappy paddles would also be nice and simple upgrade but for a manual they are not used but OK to fit (with an extra bit of coding).
Section 6 has some information on how to remove the buttons if needed and coding for the flappy paddles.