The bond made with Aquasure is much weaker than welded TPU, but in this case you are not relying on the Aquasure for a structural bond, only to make it airtight where the TPU is partly damaged. I would not use Aquasure between the seam strip and the tube fabric – even damaged TPU will be stronger, so simply reheat and reposition the seam strip, and then apply the Aquasure to make sure it is airtight. It is only a small area, so I would not worry about it being weaker, because the surrounding areas will be strong enough to compensate for it (assuming you are using proper heat sealing technique and creating good welds).
Be careful with the hot air welder – if you want to use it, practice on some scrap material first, because with hot air it is very easy to melt the TPU far beyond where you intend to, and that will create more problems (cosmetic blemishes and possibly some leaks).