Can I get an app back after uninstalling it with Storage Studio?
Short answer: Yes, as long as you haven't emptied the Trash — everything Uninstall removes goes there, so use Put Back in the Trash to restore it.
Yes, until you empty the Trash. Storage Studio's Uninstall moves the app and its leftover files to the Trash rather than deleting them, so you can select them there and choose Put Back.
Once the Trash is emptied they're gone; reinstall the app from its developer or the App Store instead.