No Hiruzen could not use anything that required specific summons or KG. When that was said it was either exaggeration or it just meant that he could use all of the basic jutsu in the village.
He obviously can't use any KG like mokuton, or sharingan, or Byakugan or stuff like that. And he can't use any techniques that would require any of those either like chidori or gentle fist. And he didn't know most of Minato's sealing jutsu, and he wasn't able to use the Aburame's bug jutsus, or Kiba's family's dog stuff, or anything that would require having multiple contracts like using toad jutsu like Jiraiya.
And I seriously doubt that he could use the Nara clan's shadow jutsus or the Akimichi clan's body size jutsus. And I know he can't use whatever Ino does. And considering that only Minato, Jiraiya, Naruto, and Kakashi know the rasengan I doubt that Hiruzen knew that either.
So he is severely limited to what jutsu is available to him. I mean he could still master all the elements and the regular A rank jutsu of the village but Konoha is pretty much only made up of KG and special abilities.
And to the kid above me where did you get that info? From the NarutoBase jutsu list? Because that stuff is just for RP and is only loosely based off of the manga.