Update: The interview went really well. They told him that he had all the qualifications they were looking for. They made him an offer at the end of the interview! They have great benefits and even said they would pay for relocation!
While this opportunity may have passed,
something to consider for the future is what they mean by "paying for relocation".
When DH's company relocated us, they paid for temp housing in the new city,
they worked with a relocation company to purchase our home at a fair market price
which they then sold at their leisure so that our family did not have to be separated while we waited for a house to sell,
and they paid for our moving expenses.
Honestly, if a company offered that kind of a package,
given how long it is taking for some homes to sell,
and families being separated for long periods of time waiting to be done and get settled in a new city,
a really good relocation package could be just as valuable as a higher salary.