I'd like to recommend you to contact Suport via this link in order to receive a detailed explanation regarding the difference between red and green battlegrounds. If you need a full explanation from developers they will need to check your battle reports.
As for the compensation, unfortunately there can't be any compensation as there is no error in this situation. I understand your disappointment but there is nothing we can do in this case. Hope on your utmost understanding.
I would also recommend not to use the information from unknown sources. We are not responsible for the information from such sites.
All of our Units have now been nerfed to their Baseline Values - https://prnt.sc/0D1vJe7Ah4w0
I imagine this was the original plan, but Devs messed it up (as usual)
All players who hit red battlegrounds while the Unit Selection Interface was BUGGED are entitled to full compensation for their EXTRA losses according to Plarium ToS
Players 'expected' to lose 19.78 million offense or defense but were victims of MISINFORMATION, so I suggest refunds should be made for ALL losses above this amount
p.s. Many different battleground calculators have been used for years to calculate Balur Strength and have been PROVED to be 100% reliable and I challenge you, mods or any other players to find any errors