Long answer: Just jump around. Once you get to the last 1/3rd of the video, there's a lot of close ups of the part of the laserdisc that recorded the credit sequence. The on-screen (laserdisc) text is clearly visible.
The author moves a flashlight around to show how the angle is important; something that won't come across as well in a blog entry.
writeup from the author linked in the video description
In this video, Tech Tangents reviews the Andonstar AD246S-P digital microscope and uses it to achieve a "world's first" by capturing clear images of video data and text directly from the surface of LaserDiscs and CEDs (Capacitance Electronic Discs).
Microscope Overview and Setup Purpose: The creator purchased the microscope specifically to document the microscopic structures of obsolete media like CEDs for the public domain [00:14].
Features: It features a 1080p sensor, HDMI output, and a flip-down display [02:41]. He notes the importance of the included remote control to prevent camera shake at high magnification [04:10].
Build Quality: He highlights thoughtful design choices, such as captive plastic inserts in the screws to prevent them from biting directly into the metal support tubes [05:51].
Initial Testing and Performance Coins and Wafers: The microscope provides impressive clarity when viewing historical coins and silicon wafers, where individual dies and traces are easily visible [11:30].
Magnification Concerns: He expresses skepticism regarding the "ridiculous magnification claims" often found on these products, finding that the high-magnification lens can sometimes be hazy [13:07].
Visualizing Video Data on Physical Media The core of the video focuses on using light refraction (diffraction grading) to see the physical encoding of video signals.
LaserDisc (CAV): Using a "The Mind's Eye" LaserDisc, he successfully identifies horizontal blanking pulses and color bursts in the disc's pits and lands [16:27].
Reading Text on a LaserDisc: In a major breakthrough, he discovers that by positioning a flashlight at a specific angle, he can actually read the end-credit text (e.g., the word "Keyboard") directly off the disc surface [22:54].
CED (Capacitance Electronic Disc): He examines a damaged CED of the movie True Grit. He manages to capture a remarkably clear image of the film's credits etched into the disc's microscopic grooves [25:57].
Additional Observations Optical Media Tracks: The microscope is used to visualize the distinct data sessions and track separators on a CD and a CDRW [27:00].
Smartphone Sub-pixels: A close-up of a Samsung S24 Ultra display reveals the sub-pixel arrangement of its OLED screen [28:37].
Conclusion: The creator concludes that the Andonstar AD246S-P is highly effective for technical documentation and hobbyist use, especially given its ability to resolve the fine details of analog video media [28:57].
Maybe it's better now, but that was how it did it recently. To be convinced that it "watches" the video, I would need to see evidence of it referring to facts that are strictly only possible to know from the video, but not guessable from the audio.