Even if you ignore the possibility that the date of the satellite picture might be false, and accept them at face value as showing black block of dark pixels that are indeed human corpses, there are still many few issues:

• the weeks between the supposed date of the picture and the video we saw means the corpses would have been there long enough to start becoming bloated, which is not visible in the pics and videos from early april, so at minimum those were different corpses
• yes people have checked the weather, temps have been too high for them to have preserved the corpses
• the satellite picture is not showing anybody near the corpses, and no russian vehicule is in sight. However what might be traces of damage from artillery shelling or similar attacks might be visible. A possible explanation might be that those were simply people killed by an ukrainian artillery attack on the russian occupied town, and yes the ukrainian themselves have presented earlier videos of supposed artillery attacks on the town (you will note how this means they didn’t care much from the civilians).
• some of the corpses seen in the later videos were seend with not only their hand attached (so they weren’t killed randomly while walking the street), but also with white armbands (supposed to mark pro russian civilians, pro urkainians civilians use blue or yellow armbands instead)
• we have a video of an ukrainian soldier seeong someone without a blue armband and asking for autorisation to fire (he got it), in other words, at least for this specific case we have confirmation of an ukrainian soldier shooting at what looked like a civilian.
• the mayor of the town made an interview on the 31th about the town having been “liberated” without mentionning anything about random killings by the russians during their occupation
• an ukrainian journalist drove empty streets the following day with not a corpse in view, and no mention of any massacre or killing, once again you might have tought that this would have been one of the first thing reported.