Update: Your screen recorder is EVEN worse than I thought...
Your screen recorder is doing some vertical tearing artifacts, by capturing part of one frame and part of the next frame. It's not even just stuttering (missed frames) -- it's mixing multiple frames into the same frame. So all prior video evidence is 100% wild good chase to red herrings, and must be completely considered invalidated.
Here's some example freezeframe grabs that shows some momentary color distortions (not sure of video file fault or website fault)
Color disortion artifact in one of your videos: Vertical tearing distortion artifact in another one of your videos. This is ironclad proof of a VSYNC violation. There are many weak links of videos:
(A) Screen recorder framerate=Hz
(B) Screen recorder correctly capturing frames between VSYNC's rather than across VSYNC's (half of one refresh cycle
and half of a different refresh cycle)
(C) Screen recorder saving the correct frame rate;
(D) Screen recorder not injecting any pulldown effects (e.g. properly doing 1:1:1:1:1:1 rather than accidentally 1:2:0:1:2:0)
(E) Website doesn't convert frame rate (right now the website you uploaded it to, reduced the frame rate to 30fps). You can bypass this by using a GDrive or Dropbo link, but that doesn't fix the other factors...
(F) Viewer display is same refresh rate as screen recorder frame rate (viewer display Hz original display Hz)
(G) Viewer browser or video player is not frameskipping (e.g. not stuttering the video playback)
etc.
For example, when I play 60fps TestUFO videos on a 144Hz display, some effects are gone.
If one of the above variables fail, you still have an invalidated video.
Can you definitively guarantee (A) AND (B) AND (C) AND (D) AND (E) AND (F) AND (G) simultaneously, for example? No.
You're asking questions several grades ahead -- please go back to the basics first and understand the basics first.
My recommendation is
1. Ignore screen recording.
2. View TestUFO links only.
3. Share TestUFO links instead.
4. If you need videos, use pursuit camera.
5. If you are writing peer reviewed literature, write academic and scientific papers using TestUFO links or pursuit camera.
If you must screen record, test the original TestUFO and screen recorder with a high speed camera, and single frame step-by-step the footage to make sure they are identical and properly perfectly recorded. You must absolute vet every single frame, one at a time. One method is to use a high speed video camera pointed at the playback of your video recorder to compare against the high speed camera record of your TestUFO animation. Another method is to single frame step by step the video and make sure it is a known sequence that you understand. Then explain the variables required to properly play back the video (e.g. which refresh rate and which video player to play the video back in, as different players will stutter differently). However, there is too much error margin with screen recording.
Better yet, you can more easily specify fewer number of variables ("I viewed this TestUFO animation while my display was configured to 45Hz") to help the viewer configure their viewer-side variables to match your source-side variables.