What an incredibly biased article. CEO's always talk positively about their company and roadmap. So by this logic any executive who sells stock at any time must be engaged in a pump and dump? It's sad people eat up such clickbait without critical thought.
Elon stated his reasons for selling quite explicitly:
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"In the (hopefully unlikely) event that Twitter forces this deal to close and some equity partners don’t come through, it is important to avoid an emergency sale of Tesla stock."
"so if the twitter deal doesnt close, will you buy Tesla stock again?"
"Yes"
Source: https://twitter.com/elonmusk/status/1557199046741094400
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TSLA is about to do a stock split, and the price is expected to go up as a result. If anything this was the worst time to sell. If he ends up buying back in later, it will be at a loss. Where's the gains here?