a colleague [...] mentioned the folder contained vector products from the LiDAR data, products such as contours, slope, aspect, etc.
Ah, but do you know for sure by examining the GDB yourself with Arc whether it is raster or vector data?
It's interesting to see the data is not LiDAR data but products derived from LiDAR data. The "derived" bit is important because that tells us it may be very different from the original, a raster, perhaps.
The second clue is that the colleague has described the data using words, slope and aspect, that more often than not apply to raster data, not vector data.
So it should all be vector data.
Maybe yes, maybe no.
When debugging such situations you can't go on hearsay. You have to check for yourself, to know for sure what is in the GDB. That saves time and effort.
Another folder in the GDB has .laz files with point elevation data.
.laz is not GDB. It is a different format. There are are plenty of opportunities for confusion when people mix up the Rube Goldberg folder structure of GDB with other files that are not part of the GDB. Maybe that's going on here, maybe not.