Hello Peers is built using holepunch modules and some 3rd party libraries but all of these are compatible with Hypercore v10 ... So to answer your question ... This article is written based on v10 of Holepunch modules...
By the time this article was written, some of the modules were not yet stable - This is why you will find in HelloPeers package.jsons a couple of dependency references from git - but we have plans of editing this guide so that it mostly uses the core Holepunch Modules.
The only 3rd party library we intend to leave as is is hyperdeebee (Because we have no intention of doing or hyperbee indexing from scratch).
Jim Moses We have upgraded all dependencies to the latest versions. Sorry, about the delay, but we had to wait until the Holepunch team has upgraded their dependencies to more stable versions before making these upgrades.