Despite the common confusion, it's not e-ink but rather a reflective LCD (rLCD) screen. It's the same principle as the original Game Boy where instead of using a backlight, the LCD reflects light instead.
This is strange. I could find no information on that page. Searching online I found a few light articles about it, some of which pointed to two YouTube videos put out by the company. However, both videos have been removed (by the uploader).
If it's about e-ink and it's not strange, it's even stranger. It's like all e-ink products are intentionally obfuscated and generally not available unless it's a hacked Kindle.
There's an early review available here for anyone interested: https://arun.is/blog/daylight-tablet/