In this latest iteration, the fuselage group is nested inside another group.
Explode the ‘parent’ group as it’s unnecessary.
That’s why I recommended Burch’s Stray Lines.
Until one is familiar with its settings, you can do damage with an advanced cleanup tool like CleanUp³
Learn to use the Select tool and Entity Info to interrogate the model.
Select one of the Edges.
The Edges in question are not strays, they’re simply visible Edges.
The Edges rendered as dashed are Soft/Smooth.
They’re all Edges, just rendered in different ways.
Notice in Entity Info you can change the visible Edges to Soft/Smooth.
You can also make Edges soft/smooth using the Eraser tool while holding down Ctrl
Or, use the Soften Edges dialog in the Default Tray.