Wait.. why is Pichai selling Google stock, when the company announced a $70B buyback

Source: SEC Filings (2024) – Alphabet Investor Relations (abc.xyz)

This doesn't make sense. Any comments? Overall, I am bullish on Google. The Open-AI 'threat' is a toothless tiger, because the company is more than a search engine. Current PE is below 25 , which is extremely juicy price for a tech company.

So, I wanted to check the insider activity as per SEC filings, and found that Pichai foundation has been dumping the stock.