I recently bought a legacy collection to have the old content and unlock the stasis. What a surprise I got when one of the main quests to unlock the aspect requires nightfall, which in turn needs the latest DLC - Light Fall.
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Swat The Bot
No longer active on Bungie.net. - old
To answer your post before you edited it: There is nothing illegal happening here. You can access every part of the beyond Light light expansion. Nightfall has always contained content from various expansions. -
Simply wait until the nightfall is one that doesn’t require dlc ownership of what you don’t have.