Hello and thank you all for your patience! A lot has changed in LiveView lately and Bruce and I are hard at work on a new version of the book with the latest version and all new code samples. Keep an eye out for that in the next few weeks.
In the meantime, yes the live path helpers have been replaced with the link/1 function component Phoenix.Component — Phoenix LiveView v0.19.5.
I believe the latest version of the book that is currently out does reflect this change though. Please do make sure you’re working off of the latest version. If you’ve purchased the e-book, you’ll be emailed when a new Beta release is made available for download and you’ll have access to download it for free.