Allow me to explain the situation.
The admin of that Chinese forum got contacted by a team called "Red Power" and was given a test PS3 with 4.21 CFW. BTW the HDMI port of that test PS3 is broken so they're using AV cables to output video, that's why the video and pics look blurry.
Yesterday the admin tested DOA5 on that CFW and it worked. As for the system time inconsistency appeared in that video, here's the words from that admin:"We recorded two video clips of DOA5 running on that CFW. However we later found out that one clip was missing the first half of the test and the second clip didn't show the detail where MM is prompting you to change SFO from 4.21 to 3.55. So we merged the two videos in one. That's why the system time appears inconsistent."
Today they tested MHP3, a popular game in Asia, and it worked too. The admin promised to release more pics and videos today.