Yeah, I'm not buying it.
The author wasn't willing to let fictional creatures "die", but he'll go with such an immense bummer plot twist? There's simply no way.
Don't care, infinitely funnier if he was in a coma for 10 years. Would be even funnier if this was the spark that got him closer to his dream of a human waifu
The chapters ending reminds me of that manga where the mc can go back in time to prevent tragedies, and when his mom died he went back to many years back to his childhood since the tragedy that killed his mom is a follow up of a tragedy from the past. And when he finally solved it, he went into a coma for 15 years, that ending was absolute bullshit.