So does the vus in summary mean that this is the amount of concurrent users that can be ran in one second at same time ?
No it’s just the last recorded value before the test exits. As I’ve explained in Why vus Change the number? - #2 by mstoykov a while back, the metric is a Gauge and it’s literally the last value recorded. As it’s very likely that the test didn’t just end while all VUs were still active and it’s also very likely that k6 didn’t record a value just as all VUs have finished it’s usually some number between 0 and vus_max.
Arguably it should just not be looked at all - it exists as it’s interesting while the test is running, especially with ramping-vus executor.
Hope this helps you