The unfortunate fact is that when you sign the declaration you...

The unfortunate fact is that when you sign the declaration you are solely responsible for your tax affairs despite receiving professional advice.

Your financial planner is an idiot and I would avoid utilizing their services anymore.

When you acquire and when you dispose of an asset there is the potential for a CGT event.

In this instance you disposed of your shares which are eligible for CGT and therefore must be declared.

The acquisition of your new shares is the beginning of a new timeline and not related to the previously held asset.

Look for publication NAT 4152

https://www.ato.gov.au/Tax-professionals/TP/Guide-to-capital-gains-tax-2016/