Unfortunately it is. Noob's high hit-box is such that all Sektor's offensive weapons are available to him. 12B1, 122, 214 strings all connect on a crouch blocking Noob. Sektor has quicker pokes as well so he can really abuse Noob up close without even having to worry about any armour that Noob may have to break out of the pressure (because he doesn't lol). So it's clear that Noob loses the up close battle.
Noob normally wins a lot of zoning battles too. Not in this case. Not only does straight missile cause a knockdown (meaning that he can trade with shadow tackle more often than not), but Sektor's iaTU will destroy Noob considering the projectiles not only have slow-ish start-up but also have terrible recovery. From full screen Noob can ill afford to throw out any shadows, and if blocked up close he's eating big time damage.
Noob's shadows are somewhat useful in the footsie game, albeit a risky approach to combatting Sektor's advancing normals such as F2 or B21, or his defensive B1. Otherwise Sektor also wins in the footsie department.
The only reason why this MU is not worse is because Noob can actually give Sektor problems on wake-up and in the corner (two glaring weaknesses in Sektor's game). The corner especially is what saves Noob to be perfectly honest. He has a bunch of potentially devastating set-ups that any Sektor player will struggle to avoid. So really that's the only chance he has of winning.
If I'm looking at it from Noob's perspective I would say be very patient. Sektor can easily bait out the shadow up knee or shadow tackle and punish via advancing normals or TU. Sometimes you might have to throw something out but be smart about it. Stay out of range of Sektor's normals and be ready to counter with well timed shadow tackles or shadow slides. Try your best to bully Sektor into the corner because that's where you can capitalise on some big damage and tricky portal/ghost ball set-ups.
Or counter-pick