Depends on what you mean by Solargraph, because it's kind of a large project. If you mean their typechecking, then definitely not, because it's not using a Ruby parser. If you mean the general feedback, then yeah potentially.
Rubocop yes if it ends up using YARP as a new backend.
Either way, I would suggest you check out ruby-lsp, which is definitely going to benefit from this speed, and soon.
The article mentions that they are building a compatibility layer around YARP that tools can use to transform its new tree format into the legacy Ripper format. They don't call out Rubocop specifically but I can't think of another OSS tool that so prominently uses the parser APIs.
I made a Ruby LSP because of this problem. It's not perfect but incase it's helpful for you. It can parse a large project with all of its gems in a few minutes. That data is indexed in an in-memory db with Tantivy. https://github.com/pheen/fuzzy_ruby_server
Rubocop yes if it ends up using YARP as a new backend.
Either way, I would suggest you check out ruby-lsp, which is definitely going to benefit from this speed, and soon.