Any tile prep suggestions from this board will not include backerboard over concrete!
You gotta strip off the sealer and wax. You can use mineral spirits to remove the wax, but you gotta be careful with it, it's flammable.
The sealer is another story. Since you know who made it, you can contact them for removal suggestions.
The final result amy still be a problem, especially if the stripper leaves a residue on the concrete. If so, then you'll need to grind off the very top of the concrete to expose fresh, clean concrete. Then you can use a good modified thinset to set the tiles.
As for transitions back to the concrete level, check out Schluter's line of edgings. They are bonded to the concrete as you tile. www.schluter.com