Hi KC No it's not incorrect sus4 chord is the 1st degree 4 and 5 degree of the scale in any order
You can see from this chart I did years ago the 4th in any key in G its C and so on...Of course there are so many positions that the chord can be played in addition to chord Inversions (or the chord not beginning with the root)
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The formula for a sus4 is 1st 4th and 5th degrees of the scale in the case of Esus4 thats "E" "A" "B"
These notes played anywhere or repeated will give you Esus4 With the key of "G" its "G" C" & "D" will give you Gsus4 The configuration of the J guitar site is a particular rendition as mentioned before. You can also play the A string D string & G string at the second fret to give you Esus4 Which is what dropping the pinky on the G string gives you. After playing it a few times I reckon its as nice just playing the "E" and then "A" instead of Esus4...So J Guitar is just another configuration. Its what you feel more comfortable with really.
The way I was saying gives you B,E,A and with the open E it isn't an inversion(Esus4) Its really not unlike the J guitar rendition if you write down the notes. (They use note repitition)
Hope this clears it up KC.
Best Regards Fenderphil.
Keep smilin' and people will wonder what you have been up to.