If you read the full article is is only talking about the subset of ICU patients who have Covid, not all ICU beds. So it is saying most of the Covid cases in ICU have Delta or are unvaccinated.
It says nothing about what the overall percentage of covid vs non covid ICU patients in ICU are.
If you click through the article you linked to the earlier referenced article there is no stated source, and only vague assertions:
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About quarter of unwell coronavirus patients arriving at hospital emergency departments are suspected of being infected with the Delta strain, even though the highly transmissible Omicron variant is dominating the tens of thousands of new infections being reported nationally.
The last report based on actual data that I have seen was the information reported by Dr Kerry Chant earlier in this thread, and that is quite different from the "opinion" articles.
Is there any update on that by her, or another from NSW Health, based on actual data?
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ABC reporting on Omicron from Dr Kerry Chant :
NSW Chief Health Officer Kerry Chant says they have been working with a company to try to determine the proportion of Omicron and Delta variant infections.
One of the pathology companies tracks this through the "S gene". She says the S gene drops out in Omicron cases.
"We've got data from the company progressively to track the proportion of Delta and Omicron and what we are sitting at is about 90 per cent now. We think 90% of the cases are Omicron about 10 per cent are Delta," she says.
"Obviously that can be different in different geographical areas but that gives the community a broader understanding.
"We have also been doing some work to understand the proportion in ICU of both Delta and Omicron and what we have seen is that early in December, from some of our sampling and we will report this in full once all the genome sequencing results are back, but as an indication in early December from the 1st to the 7th, 90 per cent of the cases sequenced in ICU were Delta and 10 per cent were Omicron. In the week of the 29 December to the 4 January we have seen that shift to 33 per Delta and 67 per cent Omicron."
So over 4 weeks, new cases in NSW ICU have gone from being 10% Omicron to 67% Omicron