The thing you have linked to is correct, but you're reading it wrong.
VHS has 240 *horizontal* lines of resolution, meaning that a grid comprising 240 alternating *vertical* black and white stripes ought to be resolvable as a bare minimum. This corresponds (roughly) to 2.5MHz of luminance bandwidth. This is also confusingly named, but there you go.
Youtube's 240p resolution is lower quality than VideoCD, and far *far* lower quality than even fairly manky VHS.
VHS has 240 *horizontal* lines of resolution, meaning that a grid comprising 240 alternating *vertical* black and white stripes ought to be resolvable as a bare minimum. This corresponds (roughly) to 2.5MHz of luminance bandwidth. This is also confusingly named, but there you go.
Youtube's 240p resolution is lower quality than VideoCD, and far *far* lower quality than even fairly manky VHS.