Yes; it does seem there are some communications confusions, here.
Sierra is (much) newer than Lion.
You’ll probably do want to upgrade to High Sierra prior to the upgrade, but should not need a (very disruptive) downgrade to Lion. But this upgrade is not required, as Catalina should allow migrating apps and data in from Sierra.
How to upgrade to macOS High Sierra - Apple Support
If you’re preparing the Mac for resale as suggested above (a reasonable guess) then loading High Sierra should work, too. Snow Leopard and Lion are what came with that, but it’s quite possible you never got a copy of one or both of those associated with your Apple ID. (And older releases of OS X have sometimes been problematic to successfully re-install at various times, too.)
To boot and load High Sierra and wipe your storage as part of selling your Mac, boot with Recovery with Option-Command-R, use Disk Utility to wipe, and leave the installer at the first prompt. Details are in the previously-linked (also below) document:
What to do before you sell, give away, or trade in your Mac - Apple Support
Make absolutely certain you have current backups of all of your data, before you start the migration, or start wiping storage.