Is solo mining not just the opposite of decentralization?
Pools are a point of centralization, since solo mining doesn't go through a 3rd party (pools) that must be relied on, it is therefore less centralized.
because a few people getting more coins?
That could be said for every coin.. (more hash=more coins), but has nothing to do with pool vs. solo mining. The only difference is that rewards come more randomly when solo than on a pool, but they average the same (solo ends up paying out slightly more even due to no fees to the pool, not to mention pool downtime, scam pools, etc.). So as long as the difficulty is low enough to find blocks in a reasonable amount of time it shouldn't matter.
For the time being, the difficulty is still low enough to find blocks with a typical single cpu (even if you only find a block every day or even few days, it is surprisingly profitable for a cpu mined coin, based on the booming trade volume on altex). Eventually, the difficulty could, and probably will soon at this rate, rise to the point where its simply not practical to keep solo mining with small amounts of hash power.
Anyways, it seems its not the case that the coin can't be pool mined, just that it requires changes to existing pool code to be compatible with its algorithm.
The dev has said in the discord channel that he will make the changes needed so that it can be pool mined, so hopefully by the time the small miners get pushed out of any realistic chance of finding a block, they can continue mining on a pool for steady payouts.