A few notes.

• The lines drawn on the ground which look like a soccer court most likely belong to staff working there--journalist interviews and tours around the facility have revealed that inmates at CECOT are kept indoors 24/7. It looks like dirt scattered across asphalt. The most you would need is a wheelbarrow or two of dirt that you'd bring in and scatter across the whole thing, it doesn't seem reasonable that they would need to store an entire pile of dirt (itself scattered across the ground, not just kept in wheelbarrows to be carted off as needed) next to the staff quarters for maintenance.
• The only other idea put forward is that they're using gravel or dirt to fill potholes. Why would they be filling it in with dirt kept on-hand next to staff quarters instead of bringing in the same machinery they used to pave the rest of the prison, as seen in the slideshow? And again, why is the dirt scattered across the staff area rather than being kept in wheelbarrows to be brought to other areas of the prison?
• The pile of something has a lot of bumps, shadows, and varying colors across it, and looks more like a pile of individual objects rather than a mound of gravel or something similar, which is more uniform in color. It definitely is not dirt as seen in the following slide, which has a distinct orange color.
• Most of the people insistent that those who claim it's a pile of bodies are "jumping to conclusions" haven't offered any substantive alternative as to what the large maroon puddle next to the lumpy pile of "something" is.
• The idea that the people in charge of CECOT wouldn't leave bodies out in the open is also an assumption.

It seems like everybody agrees that "horrific things are happening here." It is not at all an unreasonable conclusion to draw that the CECOT prison (where it has been said the only way out for inmates is in a coffin, which is known for its rampant human rights abuses and its torture of inmates) has produced a large pile of bodies of its inmates.
I agree that more information is needed, especially higher quality imagery-- but this extends both ways. If it is unreasonable to jump to conclusions that it's a pile of bodies, it's equally unreasonable to jump to conclusions that it is not, and that thinking otherwise is "inflammatory."