Disputing flawed studies does sound like something that scientists who acknowledge human-caused global warming might engage in, yes. The same is true of, for example, vaccine-autism linking studies. This is in fact something that happens all the time in the scientific community. The better question is whether those scientists were getting paid large sums of money by industry in order to make those claims (hint: they aren't--in fact, the opposite is true, with virtually all global warming denialism organizations linkable to large private investments by the oil industry).
Care to tell me how many global warming denialists don't have ties, many strong, to the fossil fuel industry and/or conservative right-wing political causes?