Rob, I didn't see anything in that Van's thread about LSAs being legal for flight in IMC (the subject of this thread).
My 2008 AMD CH601XLi-B Zodiac was widely advertised as "IFR certified" as illustrated in this ad.
My understanding (and I could be mistaken) is that in 2010, there was a change brought about by a failure of the ASTM working group to come up with a standard for SLSAs to be operated in IMC since by definition Light Sport aircraft operated by sport pilots couldn't be flown in IMC.
However, there is nothing in the regs that prevents a private pilot with a current medical certificate or the alternative BasicMed and an instrument rating from flying an ELSA in IMC if the ELSA meets the requirements of FAR 91.205(d) and the operating limitations for the ELSA stipulate that instrument flight operations are authorized.