Yes! Napoli are currently playing well despite Lukaku's absence, but the management acted in time, providing Antonio Conte with a valid replacement for Lukaku.
I'm not surprised by the situation; it's what I would have expected from the reigning Italian champions.
Will Napoli continue to dominate, Of course not.
They're currently top of the table in terms of points and position, while Juve is second. Personally, I wouldn't be surprised if Juve suddenly emerges as a serious threat in the second round. The reasoning is quite classic any time and anywhere, even the slightest mistake made by Napoli can backfire.
For example, a single lapse in concentration, a single careless moment, especially in defense, can have immediate, fatal consequences.The true winner is the one with the most discipline and few mistakes.