I don't know what they are but they don't look like a form of Eucalytus mannifera. Their foliage does not look right. Doesn't seem fine enough and not blue-grey enough.

For some strange reason, what came to (what's left of) my mind when looking at the bark of those trees was Eucalyptus michaeliana.

Would the person who put up the blog add a few more close-ups of the gum tree? Capsules (gumnuts) for example, and flowers.

I Googled Eucalyptus michaeliana and found this:

'Eucalyptus michaeliana is known as the Hillgrove Gum. The
common name refers to the village of Hillgrove, east of Armidale on the
Northern Tablelands of NSW. A large population, of Eucalyptus michaeliana, occurs near the village.

The
Hillgrove Gum is a medium to tall tree with a solitary trunk. The bark
is deciduous, smooth with white to grey blotches. Bark is shed in plates
or flakes.

Leaves are 15 to 20 centimetres long by 2 to 3
centimetres wide, lanceolate, leathery, dark green on both surfaces with
a prominent mid-vein.

Buds are carried in clusters of from 3 to 7
and these are in groups of from 3 to 5. Flowers are white and 1.5
centimetres across. Flowers are an eye-catching feature because they are
carried in unusually large clusters. Some plants are reputed to have
purple or scarlet blooms. Blooms attract many insects. Spring is said to
be the main flowering period.

The specimens, in our cold climate garden, flower in February. Small gum nuts are barrel-shaped.

Eucalyptus michaeliana is
an attractive tree and could be cultivated as a “stand-alone” specimen
or incorporated in shelterbelts or windbreaks. The species is probably
too large for suburban gardens.

Eucalyptus michaeliana is
considered to be an endangered species with three separate populations.
One is situated near Wyong, north of Sydney; another is east of
Armidale in northern New South Wales and the third in south-eastern
Queensland.

Cultivated specimens often have foliage almost to ground level.

Propagate from seed.

Warren and Gloria Sheather'

From:

https://austplants.com.au/Eucalyptus-michaeliana-Hillgrove-Gum/