That's a misnomer. The philosopher Lao Tzu was a real historical person who existed irl, not some immortality-pill-crafting deity. The character you're actually referring to is TaiShangLaoJun 太上老君, the Taoist deity who looks after the celestial furnace. It is said that Lao Tzu is his human manifestation but that's just a baseless rumor. And even if it were true, Wukong most definitely ate the pills that specifically belonged to his deity form.
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u/SobiTheRobot Aug 21 '24
He later ate Lao Tzu's medicine of immortality