Yep.
Let's see if I can get this straight.
Chelsea won the CL, they hadn't qualified through the league.
Spurs had qualified by league position, but after the whole liverpool row a few years ago each country is limited to 4 CL places.
So Chelsea as CL holders go straight into the group stages.
Spurs go into the the EL (this bit night be slightly more complicated because chelsea should have been in as fa cup winners).
But Spurs would have started in the CL qualifiers. So there some teams bumped up a round to make a full set of fixtures possible.
The knock on effect of that is one less team to parachute from CL qualifiers to EL qualifiers, so it needs a bit of re-jigging too.
And that may not be the last of it, depending on what happens in the spanish cup final next week
Probably explained better here