The circuit does work great for a pumpkin lantern but his video is more of a tutorial on coding linear congruential generator (LCG) for the 8 bit pseudo-random LED flickering. The code is short ...

[KK99] has created the simplest possible pseudo-random binary sequence generator, using a three-bit shift register. ... but the point of this circuit is to educate rather than its utility.

Thus, the sequence has limited length, and the generator continuously repeats the same pattern. The generator in Figure 1 overcomes these limitations by using random noise to form the outgoing data ...

Assigning “1” for heads and “0” for tails, we generate a random sequence of binary digits or bits. Ten tosses might produce a sequence such as 1001110100.