Can tree roots grow into PVC sewer line?

Yes!

They will cut through PVC pipe like butter with a hot knife.

absolutely, roots will find any crack or crevice even in steel pipe...
roots love that sewer juice

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Can tree roots grow into PVC sewer line?

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sort of. They won't break though a glued joint but will find any crack or unglued/poorly glued joint. Sloppily laid pipe can crack when backfilling or sometime after backfilling.

But you could run pvc though a forest without trouble as long as the joints are glued and pipe isn't put under stress after burying.

Of course

My live oak has grown all around my sewer line.
Plumber said $2,000 to fix, but recommended putting some of this down the toilet once a month.

Was having to get it snaked once a year before using this product.
I haven't had to call him back out in two years after this stuff.

Yep, especially that thin walled pvc used for sewer

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a tree root cannot penetrate intact PVC. Roots are water straws not ice picks. However large roots can and do put pressure on plastic pipes quite by happenstance and can then cause the pipe to crack. Once that happens they’ll fill and block the pipe because the water is now available

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As good an explanation as I have seen. If tree roots are in your PVC pipe, then your pipe's integrity is gone and it needs to be repaired or replaced. That will either be because of improperly sealed joints or the root path of the tree exerting pressure as described above and cracking the pipe. The second part will be due to poor routing of the pipe or poor placement of trees.