They say it has "A significant step up on factuality and coding".
My browser is underlining "factuality" in red. AI hallucinations or hallucinatiality are still a big problem in my experience.
The error was saying that "infinitely many alphabets can be generated" but there is a finite number of parameters which have a finite range of values. If Knuth had just written "a humongous number of alphabets" he would be correct.
Of course, America.gov uses "SI". From its FAQ: America.gov uses SI to find and explain information from official government sources. SI can make mistakes, so check the sources included with each answer before making an important decision. To report a problem, select the feedback button below the answer and describe what was incorrect or out of date.