It's actually not played like that. The intro tab is something like this:
1: 3X0033
2: X30033
3: 2X0033
4: X20033
5: 022033
6: X00233
7: X32033
Also actual chords used are different but I don't remember all their names.
No. 1 is G major
No. 2 is G/C (I am not sure, but it could be a variation of C itself)
No. 3 is G/F#
No. 4 is G/B
No. 5 I am not sure but could be Em7 or something.
No. 6 is Dsus4, not D major.
No. 7 is Don't know this, but some form of C.
This is how I played on that soundcloud track I shared.
Try this out and see.
- - - Updated - - -
In case you are wondering, what the "/" are. These are called Slash chords.
This means that the lower parts of the chord are the same but a note is added to the bass part of the chord. In the above examples, the bottom three strings are the regular G major shape(XXX033). But the note next to the slash is added to one of the top three strings.
Therefore G/F# would become 2X0033 (or 220033 if you can hold it that way
).