Why people say it's accidentally? It could also be teased. Not that Nintendo never teased something in a previous video and then officially announced it.
Intel Core i7 8700K | 32 GB DDR 4 PC 3200 | ROG STRIX Z370-F Gaming | Nvidia RTX 2080 Ti 11GB VRAM | Asus PG27UQ gaming on 3840 x 2160 @120 Hz GSYNC HDR| HTC Vive Pro :3
Reached PC master race level.