I didn't get any emails or messages telling me that the flight time was changed. I just checked the email with the flight details (I purchased the flight on CX website) - the time was correct.

I believe it was simply an error on the e-ticket, because everywhere else the time was correct. If I look at the e-ticket, the departure and arrival times would have made the FUK-HKG direct flight a 6-hour flight, which is definitely wrong.

As I knew that the departure time was 1620 when I did the OLCI, all I had to do was a quick check on the flight status, which confirmed a 1620 departure. So there wasn't too much of a panic.