It seems fair to call avoiding travel restrictions a dubious measure in hindsight, but circa 2019 it strikes me as a reasonable metric to put under “compliance with international norms”. There was an expert consensus that travel norms weren’t a good pandemic response tool (see my other comment) and not implementing them is indeed part of complying with the WHO IHRs.
I am not totally sure that compliance with international norms a good measure of national health security! However, the according to the Think Global Health article you linked on Twitter, even the WHO Joint External Evaluations weren’t well-correlated with COVID-19 deaths. (Those evaluations are how the prevention / detection / response capacity are measured in the Global Health Security Index, which then adds measures on health system / compliance with norms / risk landscape.)