In addition to Chrissy getting more views per video, he is also posting more videos.
Just a guess here, I would think his monthly average for the number of videos he had posted would be around 15 per month over the last 2 years. The month of October he posted 28 videos. “Watch time” is also a factor. I think a lot of his believers will watch the entire video which helps his revenue. My guess is he continues the trend of posting virtually a video a day or “monthly type challenges” to justify posting a video each day and to get people to follow along.
Social blade is nice for seeing increases is subscriber and view counts, but as far as revenue, I think it’s just to far off. There are many YouTube creators that break down their analytics and show exactly what they earn each month. You can search “How much I made from YouTube” and compare their actual numbers to what Social Blade shows. Many times it’s off by 1,000% or more.