  The Zwicky Transient Facility (ZTF) follow-up campaign of alerts released by
the IceCube Neutrino Observatory has led to the likely identification of the
transient AT2019fdr as the source of the neutrino event IC200530A. AT2019fdr
was initially suggested to be a tidal disruption event in a Narrow-Line Seyfert
1 galaxy. However, the combination of its spectral properties, color evolution,
and feature-rich light curve suggests that AT2019fdr may be a Type IIn
superluminous supernova. In the latter scenario, IC200530A may have been
produced via inelastic proton-proton collisions between the relativistic
protons accelerated at the forward shock and the cold protons of the
circumstellar medium. Here, we investigate this possibility and find that at
most $4.6\times 10^{-2}$ muon neutrino and antineutrino events are expected to
be detected by the IceCube Neutrino Observatory within $394$ days of discovery
in the case of excellent discrimination of the atmospheric background. After
correcting for the Eddington bias, which occurs when a single cosmic neutrino
event is adopted to infer the neutrino emission at the source, we conclude that
IC200530A may originate from the hydrogen-rich superluminous supernova
AT2019fdr.
