Let's look at the facts, as they are presented on the TfNSW website ...
(I spend some of my day-job doing stuff like this, so have some experience with REFs and the like)The TfNSW website says that dredging started in July 2023 and aims for completion November 2023.
www.transport.nsw.gov.au/projects/current-projects/swansea-channel-dredging. So, the fact that it has not finished yet should not be a surprise.
The dredging will take place in the channels on the lake-side side of the entrance. A quick skim over the documents indicates that the dredged sand will be pumped to the shore and dewatered (allowed to drain). This means the early stages of the project might look like nothing is happening, because the contractor is setting up the land-side part of the operation. The land-side stuff has to happen before any activity happens in the channels.
The REF (Review of Environmental Factors) is standard procedure, and its intent is to make sure nothing happens until the environmental factors have been considered and risks managed and mitigated. See
www.transport.nsw.gov.au/system/files/media/documents/2023/swansea-channel-dredging-minor-works-ref-2023-06.pdfThe REF looks at Aboriginal Heritage, as well as other environmental issues in a kind of tick-box format (the intent is to ensure that everything gets addressed, even if the questions are not appropriate for the proposed development or activity). Again a quick skim over the section on Aboriginal Heritage (Chapter 3.5) turns up the following ...
* Would the proposal involve disturbance in any area that has not been subject to previous ground disturbances? Answer - No
* Has an online Aboriginal Heritage Information Management System (AHIMS) search been completed? Answer - Yes
* Is there potential for the proposal to impact any items of aboriginal heritage? Answer - No
* Would the proposal involve the removal of native trees? - Answer No
* Is the proposal consistent with Roads and Maritime procedure for Aboriginal Cultural heritage consultation and investigation (PACHCHI)? Answer - Yes (further explanation given in the REF).
Which all means that Aboriginal Heritage has been considered, but it has not stopped or delayed the works. The works might be delayed for other reasons (e.g. inclement weather) and I can understand the OP's frustration. However, what we are seeing is due process and works proceeding as expected. If the channels are still not open in November, then that would be the appropriate time to ask questions.