how to play black ops four online without. Xbox live gold

I found this glitch out randomly because I went to my dad's house and he had a different wifi then the one my Xbox one was connected to and when I started up black ops 4 with the disc it couldn't connect and I just did what I did in the video except instead of going offline I just switched wifi signals and then hoped back on and got to play online (NOTE!. I DO NOT KNOW IF THIS WORKS ON DIGITAL COPY) as I play the disc version