MTR Online special reduced price for the two versions of Express Pass. Where to pick up upon arrival in HK

The website seems to indicate that I should bring my confirmation receipt to pickup but it says this is only done at Airport Express Customer Service Centres of Tsing Yi, Kowloon or Hong Kong Station. This does't seem to be of much use if I am flying into Hong Kong or should I assume that the pass can also be picked up at the airport station?