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Every coin which uses the same proof of work method has this problem. It is independent of the actual hashing algorithm used.

This is also not the first time this coin has been targeted.

I think it's more complicated than that. You'd need enough computing resources to "beat" half of the Bitcoin network's current hashrate, which is absolutely massive compared to BTG's.

Oops: I see what you mean though. Because there's so many BTC miners, they can easily swap over to BTG to overwhelm the much smaller network.

This is part of the reason why it's most likely everything will converge on a single money. Currencies will be issued on top, rather than dividing the global effort.

I don't think Bitcoin gold uses the same hash function as Bitcoin

Correct, it uses equihash [1].

[1] https://bitcoingold.org/equihash-btg/

Equihash is not SHA-256.