No, smeltdown was discovered by Google's project zero! In fact Intel (almost) paid researchers to not disclose similar vulnerabilities out in the openThis is the reason why most vulberabilies were found in Intel CPUs; https://www.intel.com/content/www/us/en/security-center/bug-bounty-program.html
Intel actually pays people for finding them. "Intel’s bug bounty awards range from $500 up to $100,000."
AMD had plenty of vulnerabilies, even tho they don't pay people for finding them. Meaning, very few people will spend time trying to find them. Logic 101.
It's sad that AMD does not pay people for finding bugs, when tons of big tech companies do; https://www.guru99.com/bug-bounty-programs.html
According to the VU, Intel tried to downplay the severity of the leak by officially paying $40,000 in reward and "$80,000" in addition. That offer was politely refused.
"If it were up to Intel, they would have wanted to wait another six months"