Not sure I can completely agree. What about people who are hesitant to purchase a new Tesla in 2020 because of the rumors of "plaid" versions coming? (Isn't that the very topic of this Thread?)
Maybe Tesla is somewhat more resistant to the O-Effect than selected other manufacturers, but I would guess that it is still subject to it.
Yes, by not publicly scheduling minor and major upgrades Tesla may be avoiding some forms of OE. But (unofficial and unconfirmed) rumors must still affect sales, correct?
By the way, ironically the so-called "Osborne Effect"--the (potentially fatal) negative impact to existing product sales due to poorly-timed reveals of upcoming new models--was according to
Wikipedia apparently proven to be somewhat of a fallacy in the case of Osborne, where it was likely straight-up competition with an arguably better computer (Kaypro) that probably doomed Osborne.