Not only that it he does not know how a mode S transponder works as well . The altitude is derived from barometric pressure = Also subject to outside pressure variations .if the values transmitted down by the extended squitter are exsessive and short burst they are unlikely to be real . In other words it is not because you have huge burst of altitudes that you can deduct vertical rates and that the actual aircraft went there . They are just coded alt bursts and that why in ATC we filter them out .
Not saying that is what we have here but it surely looks like it to me .( unless of course the values are increasing over time and the responses sequence , I have not seen them )