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The author seems to make a circular argument: foundational languages look like C++/Java, Python doesn't look like C++/Java, ergo Python is not a foundational language.

There are no foundational languages, what is foundational is CS theory itself. C++ and Java are just part of the ALGOL tradition, which syntactically relies on a bunch of arbitrary choices (curly braces vs indentation is an arbitrary symbolic choice and any preference is personal and subjective), and furthermore were highly influenced by 70s computer architecture that doesn't really exist anymore. In other words: just a bunch of legacy choices.

Python is the best general-purpose language there is at the moment, because of its popularity, ubiquity, actual use in a wide diversity of domains and availability of libraries for almost anything you can think of. Furthermore, the syntax is simple enough for one to be able to keep it all in one's head and not having to constantly refer to documentation. If you learn Python today, it will likely be useful to you for the rest of your life in a variety of situations.

Getting used to curly braces in ALGOL-like languages is a minor intellectual challenge compared to what awaits someone taking a Computer Science or Engineering degree.