There's also a massive surge of simplified chinese users in the same month, along with a small increase in previous gen GPUs[1], so I suspect it has more to do with more older builds being sampled than intel gaining marketshare.

[1] If you check gpu market share for windows, the usage share for many nvidia 10xx, 16xx, 20xx series gpus went up. The first two are out of production years ago, and the last was out of production early/mid last year.