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True, initially I was suspicious, too. But given the fact that the bb shell and the tt look like max, I don't think it is a cheapo diy job. If it had normal tubes, it could have been a re-welded diy gas pipe beater. If the price stays low, it might be worth to take a punt.
@mcamb no idea tbh but I guess there's ways to blast it without taking off too much material: low pressure, plastic- or dry ice blasting etc
p.s. I'd be more worried about the rust on the top tube, thin tubing doesn't take kindly to rust.
Picture 10 with the webbing looks to me like it is some type of body work filler like you would use on a car.
I would be very cautious.