Whether or not OP has multiple accounts I wonder why they come to this conclusion now AFTER the player deposited and LOST half a million $ ? Now that he won a fraction back they suddenly find out that he has multiple accounts? Sounds a bit odd to me to say the least.
Sure it's possible but why allow him to play and LOSE in the first place.

Also, what reason would he have to play with a different account while an account that has already so much loss and wager obviously get's way more bonus/perks than any other newly created account? Doesn't make too much sense right?

Not saying he doesn't have multiple accounts but something just doesn't add up because he already lost so much money there. Saying a player is multi accounting is always such an easy way out for any casino.
What I also wonder is, why was his account reinstated twice (with the possibility to withdraw) if they already found this violation?

Lastly, why no reply to the casino guru case as well?

Anyway, kicking out a SVIP10 player with around 25 million wager and over 500k in losses over this shows how desperate BC is for money. Don't forget, this site lost their Curacao license and was declared bankrupt for that matter only some months ago. Then they quickly moved to the "Autonomous Island of Anjouan" to get a license there.