  Supernova (SN) 1987A is widely regarded as an excellent candidate for
leveraging the capabilities of the freshly launched XRISM satellite. Recent
researches indicate that the X-ray emission from SN 1987A will increasingly
originate from its ejecta in the years to come. In a previous study, we
thoroughly examined the proficiency of XRISM-Resolve in identifying signatures
of shocked ejecta in SN 1987A, synthesizing the XRISM-Resolve spectrum based on
a state-of-the-art magneto-hydrodynamic simulation. However, following the
satellite's launch, a technical issue arose with the XRISM instrument's gate
valve, which failed to open, thereby affecting observations with the Resolve
spectrometer. Here, we update our analysis, reevaluating our diagnostic
approach under the assumption that the gate valve remains closed. We find that,
even with the reduced instrumental capabilities, it will be possible to
pinpoint the ejecta contribution through the study of the line profiles in the
XRISM-Resolve spectrum of SN 1987A.
