Yes the plants will be relevant to your hot southern climate.
The one part that you will have to adapt is "first planting date" and "last planting date" because those are tied to Northern climate and will be different for your planting zone.
The rest of the plant details will be useful, plus there is a "heat tolerance" listing on each plant. (you may like to avoid the cool weather crops). i will include a couple of sources for planting calendars on-line where you type in your "last frost date" to receive the planting dates for annual veggies.
also check out the "updates" section for the first update, where you'll see an example of all the information available with each plant. and Update #3 for the table of contents.