It was an idea from Peter Sharp, and which seems relevant if the hotter air comes from the central heating wire like this (from the preprint):
The larger the balloon, the smaller the temperature differences required to compensate for the mass. As a result the positive or negative consequences remain to be known.
Although there are unknowns, this could be a way to avoid the use of helium and hydrogen which have major disadvantages. In this case, low aerostatic lift would be enough to keep the balloon in the air, in particular thanks to the use of light fabrics such as ripstop.
If the centrifugal force linked to the use of Magnus effect balloons turns out to be little positive or even negative, the fact remains that the central heating wire could be a solution for more traditional captive balloons but still including an aerodynamic lift component. We would still benefit from the possibility of using lightweight ripstop fabrics.
In all cases the aerodynamic lift would occupy the majority of the total lift, while the aerostatic lift (by central heating cable) would only be sufficient to compensate for the mass of the balloon.