I think that's what he's trying to say here - most of us don't care if the universe is a simulation, just if we can continue to solve problems in it (live).

I think you might struggle with the justification or certainty portion.

Otherwise, adverse feelings towards simulation tend to stem from elsewhere, namely the inability to ascertain what is real (the root of madness), an aversion to that greatest of promised simulations, heaven, or an innate desire to not be trapped in substandard eventualities - e.g. all man made simulations thus far suck hard donkey balls in a myriad of ways.

In light of solving the past three problems, sollipsism at least as I understand you to mean in this context, solves the problem of providing us a framework to tackle dealing with those issues, otherwise for the rest of us, we don't care.

I don't much care for the OPs article either, it's as much nonsense as calculating the size or speed of the universe using Genesis's 7 days of creation - that is to say it is hypothetical if not theoretical and ultimately conjectured.