Note that the first item in the referenced thread looks positive, but the next two basically rule out the source as being too restrictively licensed.
What would concern me about the alaska.edu site is a failure to clearly state the licensing terms. If you can possibly use data directly from USGS, it might be easier as US federal agencies commissioned work is normally in the public domain for copyright purposes, but US educational institutions cannot put things into the public domain, for copyright.
I note that the the data is on an unusual coordinate system, so will need correcting to the the system used by OSM.
I also note that USGS say that the data only meets federal mapping standards at scales about 1:24000. As noted in the referenced thread, you will need avoid over-writing higher quality data.