`Task` at `createSampleData` function in What's new in SwiftData session

I was looking to the example code that point from What's new in SwiftData session and noticed something that I cannot understand about Swift concurrency. from this snippet:

       static func createSampleData(into modelContext: ModelContext) {
        Task { @MainActor in
            let sampleDataTrips: [Trip] = Trip.previewTrips
            let sampleDataLA: [LivingAccommodation] = LivingAccommodation.preview
            let sampleDataBLT: [BucketListItem] = BucketListItem.previewBLTs
            let sampleData: [any PersistentModel] = sampleDataTrips + sampleDataLA + sampleDataBLT
            sampleData.forEach {
                modelContext.insert($0)
            }
            
            if let firstTrip = sampleDataTrips.first,
               let firstLivingAccommodation = sampleDataLA.first,
               let firstBucketListItem = sampleDataBLT.first {
                firstTrip.livingAccommodation = firstLivingAccommodation
                firstTrip.bucketList.append(firstBucketListItem)
            }
            if let lastTrip = sampleDataTrips.last,
               let lastBucketListItem = sampleDataBLT.last {
                lastTrip.bucketList.append(lastBucketListItem)
            }
            try? modelContext.save()
        }
    }

From the code snippet, I cannot see any task that needs to be marked with await, and it is also marked as @MainActor.

My question is: why do we need to put Task here? It seems like all the code will run on the main thread anyway. I am just afraid that I might be missing some concept of Swift concurrency or SwiftData here.

Thank you