The author of the article did not encounter a single source on the Meissner-Oxenfeld effect, where the version that this effect is explained by the presence of eddy currents in superconducting ceramics would be questioned.
But, in the opinion of the author of the article, ceramics in such a state are surrounded by such gravitational fields, which, when cooled, turn into gravimagnetic fields, which, together with the gravimagnetic fields of the Earth, pull all the magnetic fields from the ceramics body.