Is that possible someone edits the combatlog to cutdown the duration with incredible casting and cooldown?

Is that possible someone edits the combatlog to cutdown the duration with incredible casting and cooldown?

https://classic.warcraftlogs.com/reports/rN87XpJQzTLFYg92#translate=true&fight=1&type=casts&source=47&options=1026&view=events

This combat log is from a guild which ranked 17th in China region. In Razorgore’s combat, the Destory Egg should has 3 sec cast and 7 sec cool down. However, in this case, each casting of Destroy Egg is less than 3 sec, and each cooldown of the Destory Egg is less than 7sec.

It is so wired, then I review the whole logs. I found that everyone has a incredible casting and cooldown.
For instance, we all know the frostbolt should has 2.5 sec cast and GCD should be 1.5 sec. This guy has average 2.35sec cast for frostbolt https://classic.warcraftlogs.com/reports/rN87XpJQzTLFYg92#translate=true&fight=15&type=casts&options=1026&view=events&source=27

and the other guy has average 1.3sec cast flash heal.
https://classic.warcraftlogs.com/reports/rN87XpJQzTLFYg92#translate=true&fight=15&type=casts&options=1026&view=events&source=11
Image_20200508232425

You guys can review whole log. Everyone has like a speed up ability. Then I review another combatlog from last month. It seems like it happens all the time if they has a less than 30min record. https://classic.warcraftlogs.com/reports/yabCYJvWZRM49xtG

It is not lag or something. It happens all the time, so I guess they edited the combatlog before they upload. It seems like they compressed the time about 150ms each second. Please someone can figure it out?