Why would this be necessary?
Do you have multiple GPUs?
Even in the case of hybrid graphics mhwd profiles are provided.
Where did you get 2015? Is it accurate for your hardware?
Also, if you didnt run sudo update-grub afterwards it would have no impact.
Both of the above are pretty easy to remove.
Though you may need to chroot in.
As to
This has multiple parts and some portions do not describe concrete steps to take … so I’m not sure what exactly you did while following this portion of the guide.