I’ve addressed the above deprecation notice in my PR in this feature request, which improves the behaviour of the PDF links so they always open in a new tab - this addresses several of the concerns up the topic.
Basically, it means that on mobile there is now one-tap access to the pdf content (before it was multiple taps / wait / etc), as well as in desktop situations where this is desired.
It is a bit naughty combining a fix and a new feature, but I needed to modify the detection of mobile to change the behaviour.