Aircraft Age??
According to Boeing's response to the crash:
The airplane, serial number 49183, Variable 80C211, was delivered to a different operator in December 1983. At last report, it had accumulated approximately 64,679 hours and 34,202 cycles.
Seems dear Mr Udom did not do the math correctly and cut the age of the aircraft in half in the media report. Also keep in mind there is the likely fact that nothing had been reported on times and cycles since this aircraft arrived in Thailand.
As to the visual effect of the video taken after the crash and what may have been present on the approach. Anyone who has spent any time in a monsoon downpour can attest that minutes and even seconds can mean the difference between some visibility and none.
Just more fuel for the fires of speculation!!!