Those Dengeki numbers...wow. Didn't expect that much for week 1.
And Switch's software is pulling insane numbers. Smash becoming the best selling game of 2018 in under a month, SMP is doing insanely well, MK8DX at 2m, Mario Odyssey at 1.9m, etc. The system already has six 1m sellers and three 2m sellers in under two years. 2019 will be an even better year in terms of software for it with AC and Gen 8 especially, as well as more substantial third party titles (YW4, IE, DQXIS, etc.)
From the quoted numbers, Switch's week 52 in 2018 was larger than 2018's week 1. So the 2019 Week 1 is 25% increase of an already much bigger number than Week 1 2018, so comparatively it's roughly a 79% increase over 2017's Week 52. 248/138
I don't think anyone would turn those numbers down.