Facebook the product is run by a company named Meta. Google the product is run by a company named Google, which is owned by the conglomerate Alphabet. Google is the vast majority of Alphabet, and they share CEO and CFO. So when you talk about Alphabet's finances or stock price, you're mostly just talking about Google but the name Alphabet is correct. However if you're talking about a company doing thing, you're almost certainly talking about one of the subsidiaries.
Eg, "Google made AlphaGo" or "Google's Deepmind made AlphaGo" is incorrect, but "Deepmind made AlphaGo" or "Alphabet's Deepmind made AlphaGo" are correct, while "Alphabet made AlphaGo" is technically correct but unspecific.
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This is likely the correct way to state things.
Facebook the product is run by a company named Meta. Google the product is run by a company named Google, which is owned by the conglomerate Alphabet. Google is the vast majority of Alphabet, and they share CEO and CFO. So when you talk about Alphabet's finances or stock price, you're mostly just talking about Google but the name Alphabet is correct. However if you're talking about a company doing thing, you're almost certainly talking about one of the subsidiaries.
Eg, "Google made AlphaGo" or "Google's Deepmind made AlphaGo" is incorrect, but "Deepmind made AlphaGo" or "Alphabet's Deepmind made AlphaGo" are correct, while "Alphabet made AlphaGo" is technically correct but unspecific.