Maybe they couldn't have had exact estimates, but there was plenty of data they could have used to approximate in broad terms that crypto mining was tilting the scales. Let's face it, everyone who was tuned into the PC hardware scene at the time knew it. This wasn't a case where we only saw in hindsight how crypto mining tilted the market, we all knew at the time too. We could see the massive increase in mining activity on the blockchain, we could also see loads of new mining operations starting up with gaming GPUs. The miners weren't hiding it, they were posting pictures of their massive operations for everyone to see. And I'm sure Nvidia had better data than we did. So Nvidia avoiding mentioning any of this to their shareholders when presenting them with rising "gaming" revenue was very suspect indeed.