IFR covers asymptomatic, yes.
There's another measure CFR - Case Fatality Rate - that covers people with symptoms. That is a higher %, for fairly obvious reasons.
The terms come from the quaint old days when we only said something was a 'case' if the person actually had symptoms, as opposed to now where we're all supposed to act ill whether we are or not.
I said pretty much from the start that I expected the IFR to land between 0.1% and 0.2%. I still think that is most likely.
(And before someone points out that the official figures have > 0.2% of the UK population dying of Covid already - well, even taking those figures at face value, and there are many reasons not to, the IFR in the UK is going to be higher than the global IFR because of the general unhealthiness of the UK population (obesity, diabetes, lung disease, vitamin D deficiency, plus generally people living to quite an old age in often quite poor health).