That's no different than saying the English alphabet is just a modified version of the Anglo-Saxon futhorc runic alphabet, and that with a dictionary and a bit of training you could use that too.

'ȝ' becomes 'g', 'Ð' becomes 'D', and we still use 'æ' today, which is also a rune, and they even used 'W'!

Also, the number of characters in Chinese has also drastically changed over time. So while many characters have a 1:1 lineage, far more characters simply did not exist 1 or 2 thousand years ago.

The only commonality is that they are based on pictographs and have a traceable etymology, although that's true for all languages.