What do you think a product/brand website is?
Their second definition: "a public notice, especially in print". So, yes, by that definition.
The second definition is second for a reason, though: The first usage is more common. When people say "Tesla doesn't advertise", they mean the first definition. Trying to conflate it with the second definition does not take the discussion anywhere useful.
Not at all a compelling argument.
Per the Oxford dictionary (https://www.lexico.com/definition/advertisement), the first definition of "advertisement" is "a notice or announcement in a public medium promoting a product, service, or event or publicizing a job vacancy."
Per Mirriam-Webster (https://www.merriam-webster.com/dictionary/advertisement), the first definition of "advertisement" is "a public notice".
Per Collins (https://www.collinsdictionary.com/dictionary/english/adverti...), the first definition of "advertisement" is "an announcement online, or in a newspaper, on television, or on a poster about something such as a product, event, or job."
Per Cambridge (https://dictionary.cambridge.org/dictionary/english/advertis...), the first definition of "advertisement" is "a picture, short film, song, etc. that tries to persuade people to buy a product or service, or a piece of text that tells people about a job, etc."
All that's happened here is that they've been advertised at and they have swallowed the advertising hook, line, and sinker.
And because they'd prefer to think of themselves as sophisticated rather than gullible, they then make these dishonest semantic arguments in order to find some desperate difference between marketing and advertising that their ego can live with.