Unless there’s more to this, it doesn’t seem very useful to me. It seems obvious to me that you’ll find some RNA. However it would likely be damaged/fragmented.
I’m not sure about the second reference, it would be interesting to dig out the original study.
— Research found that SARS-CoV-2 was detectable in quantities large enough to be infectious in aerosols for up to 3 hours, up to 4 hours on copper, up to 24 hours on cardboard and up to 2-3 days on plastic and stainless steel.
https://www.journalofhospitalinfection.com/article/S0195-670...
Human coronaviruses can remain infectious on inanimate surfaces for up to 9 days. Surface disinfection with 0.1% sodium hypochlorite or 62–71% ethanol significantly reduces coronavirus infectivity on surfaces within 1 min exposure time. We expect a similar effect against the SARS-CoV-2.