Reversability?

Here's a picture I took yesterday of the facade of the church. The original facade is on the left, and you can see the recent intervention on the right.

As an amateur restorer of fine art for decades, I've known for a long time that reversability is the number one rule in the restorer's craft. It is a matter of ethics. If I am to make changes to an old work of art, I must use processes and materials that are reversable, so at some later date, my intervention can be undone. That way, no matter what the level of knowledge and skill the restorer has, people in the future will always be able to get back to the original. If conservation technology and materials advance, restorers in the future will be able to start from scratch.

From March to the end of July this year I worked as a restorer on the interior of this church, as an employee of Straulino Restoration, a very professional outfit which has done important work throughout Mexico. The conservators in charge of the project did a very good job of investigating the history of every aspect of the altar, finding the original finishes when possible, documenting absolutely everything, and explaining the justification for each and every decision. "Reversability" was like a mantra--they mentioned it over and over again. Throughout the world, reversability is the first imperative of their profession.

The reasons for the decisons made on the exterior intervention are extremely complicated, and it will take several more posts to explain the whole situation. For now I would like to humbly ask those responsible: How in the world is THIS reversable?????????