Short answer. No, not yet. Article 1677 provides that the purchaser in a sale with right of redemption cannot use the power to eject the lessee until the redemption period ends. Until then, the seller's right to buy back the property is still alive, and the existing lease continues to run.
What the law says
The purchaser in a sale with the right of redemption cannot make use of the power to eject the lessee until the end of the period for the redemption.
Civil Code, Article 1677 — Buyer in a Pacto de Retro Sale. Read the full provision →
Ejectment has to wait for the redemption period
Article 1677 answers your question directly. It provides that the purchaser in a sale with the right of redemption cannot make use of the power to eject the lessee until the end of the period for the redemption. A sale with right of redemption, or pacto de retro, leaves the original seller with a live right to reclaim the property within an agreed period. Because that right is still pending, the buyer's ownership is not yet final in the way it would be after an ordinary, unconditional sale, and the law holds off on letting the buyer exercise the power to evict the lessee until that uncertainty is resolved.
Why the tenant's lease is protected during that window
If the buyer could eject the existing tenant immediately after the pacto de retro sale, that could disrupt the property and the tenant's rights before it is even settled whether the seller will exercise the right to redeem and recover the property. Holding off on ejectment during the redemption period keeps the situation stable while the underlying right to redeem is still open, rather than forcing changes to possession that might have to be unwound if the seller redeems the property afterward.
What changes once redemption expires
Once the redemption period runs out without the seller exercising the right to buy the property back, the buyer's title becomes consolidated and unconditional. At that point, the restriction in Article 1677 no longer applies, and the buyer may then exercise the power to eject the lessee, subject of course to whatever other rules govern lease terminations generally. The limitation in this article is tied specifically to the pendency of the redemption right, not to ejectment powers as such.
What this means for you as the buyer
If you bought property through a sale with right of redemption and there is a tenant already occupying it, you should treat the redemption period as a waiting period during which you cannot use your ownership to remove that tenant, regardless of how the lease itself might otherwise allow for termination. Your ability to eject the tenant is tied to the redemption period actually expiring first.