Orruk Warboss legal in Big Waaagh?

[CompStompa]

I have an upcoming tourney game against a Big Waaagh list that includes an Oldhammer Orruk Warboss on boar with banner. 

Is this legal as of GHB 2020 for standard matched play pitched battle rules?
 

The Oldhammer Greenskins are in the “Legends” section of the GHB. 
 

I have asked my TO and waiting for a response, I just wanted a second opinion so I can see if I am insane for fighting this. 
 

Thanks!

[EMMachine]

12 hours ago, CompStompa said:

I have an upcoming tourney game against a Big Waaagh list that includes an Oldhammer Orruk Warboss on boar with banner. 

Is this legal as of GHB 2020 for standard matched play pitched battle rules?
 

The Oldhammer Greenskins are in the “Legends” section of the GHB. 
 

I have asked my TO and waiting for a response, I just wanted a second opinion so I can see if I am insane for fighting this. 
 

Thanks!

You have to ask for permission because it is a Legends Pitched Battle Profile but other than that it shouldn't be a problem because you only need the Orruks Keyword (which Greenskins have).

Keep in mind that there was a Grand Alliance Destruction Errata, that changed the rules for Waaagh! and Waaagh Banner after Orruk Warclans was released.