Not only is this paper real: https://arxiv.org/pdf/2304.01393.pdf
But they actually made it practical:
We have implemented two ways to reveal the
actual names present in an overlapping stack, when viewing a PDF
file on a computer.
First, hovering over the stacked names should pop up a tooltip
with the authors listed in their original order, as shown in Figure 1.
This feature works on many desktop PDF viewers (e.g., Acrobat,
Evince, Firefox, VSCode), but notably not Chrome, Edge, Safari,
or MacOS Preview. It also does not work on mobile devices we
tested (probably because they lack a natural notion of “hovering”).
Not only is this paper real: https://arxiv.org/pdf/2304.01393.pdf
But they actually made it practical:
And the authors are father and son!