The more libertarian arm of the Tories aren't big on regulating business so I expect what they want is for any business or org to do what suits their working model best.
This of course works in both directions, they probably want companies and orgs to be confident they can invoke SSE if they choose and understand it's perfectly fine and legal to do so.
On the flip side some places - an LGBTQ nightclub for example, will probably want to have mixed sex spaces in line with what they believe and the gov probably doesn't want to interfere with that either.
I think Truss is hoping for a return to common sense and market forces dictating these decisions. Which does also put the onus back onto women to fight our corner e.g refusing to use a business or service (and telling them why) that does not accommodate women and girls safely or in a way that is dignified for us. Maybe even bring discrimination suits for places that do really daft things like provide male only toilets but no female toilets.
I don't know if she's being naive as to the extent orgs are being pressured over perfectly legal exemptions and how this has all come about.
I suspect it's more that they don't want it to become the government's problem beyond reinforcing what the EQA says which is if you want your org to provide a single sex service it is completely legal to do so.