No, it is not.
Currently there is only one active signature: startWith(…values)
Apart from this signature, it has several overloads which accept scheduler: SchedulerLike as the latest parameter: startWith(…values, scheduler) and this functionality has been deprecated.
If you don’t use scheduler with startWith you are fine.
If you do, then you need rewrite your code using scheduled function like they suggest in the comment beside depreciation annotation: scheduled([[a, b, c], source], scheduler).pipe(concatAll()).
Highly likely, you are using startWith(null) or startWith(undefined), they are not deprecated despite the notice, but IDE detects a wrong function signature, which is deprecated, and shows the warning.
Or, you are using formControl.valueChanges which emits any type, or any other observable stream with any. Because any matches the SchedulerLike, you see the notice.
Therefore, try to avoid any via adding filter((v): v is number => typeof === 'number') or any other possible way.