Now? You would waste your money. I don't see anyone wanting to invest in an utterly obsolete ruleset; learning rules that remind you of the official game that yet differ in a thousand little (and in a few cases not so little) ways.
Playing an old game such as original D&D? Fine. at least once it was an established game. But in this case, the playtest rules iteration that was printed on the book only effectively existed for a month or two. It would be a waste of your brain power to learn that version of PF2, when you could choose either the final playtest version or the actual official rules.
Ideally, all the copies of the printed initial playtest book would be returned to sender and pulped. I feel sorry for that earlier guy who apparently didn't look closely enough and ended up paying money for a copy.
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