Nobody says Delta is equal to Naruto. Most people say she'd lose to SM Hokage Naruto. Naruto also says right after that he held back but not a ton.

Naruto is as clearly holding back and even states he was. Naruto could’ve used tailed beast transformation and blew up the whole area and jumped her with dozens of shadow clones or used more ninjutsu. But he held back in terms of Destructive Capabilities. But in terms of Physical Speed and Taijutsu delta actually had as keeping up with him. Naruto was not holding back in terms of Taijutsu.

Naruto wanted to protect the kids

Get intel from delta

Not accidentally kill her

Nobody says Delta = Naruto

At MOST she might be equal to post BM Naruto

At most, I think she's relative towards So6p Naruto.

In terms of Taijutsu, Naruto had to hold back to protect the kids and we've seen better against Jigen/Momoshiki. It really is just a Naruto holding back with so many handicaps on him due to the situation and people will say she's relative.

If we go by other scaling, WK Code was scared of SM Hokage Naruto and wanted to team up with Borushiki to fight him and Delta scales below WK Code.

This Delta was weaker. Current Delta might be even.