Not a justification. Thats what was in the episode. Those drones were not using cloaking technology. You guys are so desperate to say that Berman trek has worse canon issues than kurtzman so are trying to throw people off. Maybe you all just dont know the Berman Trek to well. Again it was drones that had holographic projection tech and the drones messed with sensors. Thats not how romulan ship cloaks work.
You might want to take it up with the writers of the ENT continuation novels then if this is so very obvious -
An explanation is given for this inconsistency in the non-canon novel The Good That Men Do. The novel explains that the ships seen cloaking in this episode were two prototype Birds-of-Prey which were being tested at the time. The Romulans had previously experimented with cloaking technology, but had only been able to apply it to their mines and not to their ships due to the huge amount of power needed. These ships were an attempt to deal with this problem. According to the novel, the prototype Birds-of-Prey were ultimately unsuccessful, as the power needed put too much strain on the ships, and one of them was destroyed in an antimatter containment failure caused by its stealth systems. It would then be decades before the Romulans would successfully solve the problem.
Or does it only break canon if you don't like it?
