"If Pixel was registered in Delaware in 2015, why does the recent 8-K mention audited fins for 2014 and 2015?"
One possibility is that many corporations being their existence incorporated in other states and when they tee up for an IPO or merger into a public entity, they reincorporate in Delaware. Butt this is mostly for legit companies.
So the 2014 audit may be from Pizel's corporate existence in another state before reincorporation in DE. It's pretty common.