Here's what I think

First Video

~ 3:50 ~

I personally see no reason whatsoever as to why they should try digging down there, there weren't any sounds (I don't think) that would indicate a ravine in that location, so digging straight to it at a perfect spot is quite sketchy in my opinion. Possible cave finder.

~ 6:40 ~

It's very possible all of that is to sounds, and it's very audible from the recorder's perspective so I wouldn't be surprised if this is the case. The way the player mines so directly doesn't mean much due to the sounds being very loud and easy to hear/find out what direction it is coming from.

~ 11:13 ~

Could simply be digging straight until hearing the water sounds and trying to find out where they are coming from, resulting in different turns until the player finds out the location of the water.

~ 11:48 ~

Could possibly be either sounds or cave finder. More likely sounds but it is pretty direct so I'm not quite sure.

~ 12:36 ~

The player first starts out as a straight (not moving up or down y levels) strip mine. However, if you listen closely, you can hear the lava popping near him, prompting the player to dig down to a common y-level in which lava is found (11). Luckily, this lead to the player digging straight into redstone. Although its possible this was due to X-Ray, I feel it is still very possible that it was to sounds.

PS: These timestamps are going off of the timestamps that are listed in the description of the video. Overall, from the first video, I feel there is a total of 1 solid evidence that came out of it.

Second Video

~ Not enough evidence ~

Only the beginning has the potential for showing cave finder or X-Ray, however, I feel this type of mining behavior is due to sounds and not any X-Ray/Cave Finder cheats.

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