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How can you just join the neutral bar in the CU to the earth bar
You can't. Davesparks actually said:
link the neutral to the earth bar
Meaning the incoming neutral upstream of the RCD, not the neutral bar downstream of it.
Note that the RCD protects against faults on the opposite side of itself to the N-E link because that's how current bypasses it to create an imbalance. Want to protect the installation downstream? Put the N-E link upstream. Linking the neutral and earth bars in the CU downstream of the RCD won't protect the installation, only the inverter upstream of it. Such a link downstream of an RCD will cause an immediate trip on a DNO supply because there is already a link at the substation upstream. Having a link either side of the RCD allows some neutral current to bypass it and create an imbalance.
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