Have visited Whistler years ago, but not for mountain biking so that's still on my bucket list. But if I was to travel half way across the world I would probably rent a freeride or DH bike to have good margin for error. I don't know what the trails are like in Whistler, hard to tell from videos. Maybe most lines are smooth as butter?
One thing I would be concerned about would be how a lightweight build would hold up for big hits. I went to a bike park in Spain once (profile picture) and I don't think the SL would have survived 10 minutes there (or me if I would go over the bars). Maybe enduro is defined differently in different parts of the world. I still don't think the SL should be taken for an enduro bike. Just my opinion. Or my riding skills. ?
I would definitely consider what time of year you intend to go Whistler as the trails can get pretty beat up from mid July until the end of August, especially during Crankworx. Then again, you would be missing out 75% of what Whistler and its surrounding area has to offer, if you only went to the bike park. There are many trails in the valley and in Squamish that perfect for the Levo SL. If you want a "butter smooth" bike park, the only one that comes close is Coast Gravity Bike Park in Sechelt. The only time Whistler has trails as "smooth as butter" is on Opening Day! I have never ridden a 29er at the bike park but my wife has ridden her Levo SL, with a proper fork, all over the area and has found a renewed confidence in her riding skill. The "lightweight builds" mostly described in this forum would be fine in the park if you are willing to do the recommended progression and not begin on A-Line as those table tops are pretty big. Also, Goats Gully and In Deep, which are both Double Black tech trails, are pretty sketchy on any bike, without a considerable amount of skill. Similar to what Squamish has offer with so much more and no lift lines!
This begs the question; what kind of trails do most people ride on with their Levo SL? I see some pretty heavy duty brake and suspension setups so I assumed people were riding some pretty gnarly stuff!