Particularly, 'The Dynamic and Static events are mixed in(mostly) by using "<<" Left Shift Bits. Because it's a binary operation, every digit is a power of 2, so shifting the bit n positions ends up multiplying by 2^n. This adds further confusion when multiple numbers are used at once.' --- the tweet appears to be confusing C++ stream usage of "<<" with shifting (and as a result makes it sound like the code is doing something idiotic).

Here is how it works: Lots of potential entropy sources including the essential good ones (as well as junk ones like timestamps and user/host info) are fed into a cryptographic hash then strengthened with iterated hashing. The junk sources are included as a hail mary so the user might have some chance to move their funds if they learn about vulnerabilities in their OS/hardware RNGs before an attacker can brute force out the weak sources.