  The ATLAS collaboration has recently reported the results of a low-mass
Higgs-boson search in the di-photon final state based on the full Run 2 data
set. The results are based on an improved analysis w.r.t. the previous
analysis, which included a part of the Run 2 data, with a substantially better
sensitivity. The ``model-dependent'' search carried out by ATLAS shows an
excess of events at a mass of about 95.4 GeV with a local significance of
$1.7\,\sigma$. The results are compatible with a previously reported excess at
the same mass, but somewhat higher significance of $2.9\,\sigma$, from the CMS
collaboration, also based on the full Run 2 data set. Combining the two results
(neglecting possible correlations) we find a signal strength of
$\mu_{\gamma\gamma}^{\rm ATLAS+CMS} = 0.24^{+0.09}_{-0.08}$, corresponding to
an excess of $3.1\,\sigma$. In this work, we investigate the implications of
this result, updating a previous analysis based solely on the CMS Run 2 data.
We demonstrate that the ATLAS/CMS combined di-photon excess can be interpreted
as the lightest Higgs boson in a Two-Higgs doublet model that is extended by a
complex singlet (S2HDM) of Yukawa types II and IV, while being in agreement
with all other experimental and theoretical constraints.
