Delamination is a bubble between the layers of fiberglass or resin. Generally this happened when you have a leak as you know. The best way to see if it is delaminating is to tap on it slightly with a small hammer, and listen to the sound. Again tap slightly. If the fiberglass is delaminated you will here a thud sound instead of a solid sound.
Also, to your question. As you stated you had repair work done on your unit. During the repair and when the fiberglass sheet was replaced, there may have been a bulge in the insulation or something under the sheet to cause the bulge. Not delamination. Fiberglass by its very nature cures over time. It is baked in ovens at 180F to kick off the initiator and set the resin to harden. The hardening process takes time and if there is pressure pushing from the backside it will bend. Fiberglass is not steel and will bend over time in the heat of the sun should it have influences under the skin.
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2017 Rezerve 32SB
2008 Ram 3500 DWD
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