Are dropside costs recommended/safe to use? Thanks

Product Safety Australia has the following information in relation to types of cots in Australia that must comply with mandatory standards.
These recommendations include drop side cots

Household cots can include the following types:

rectangular cots (typically) that are a permanent sleeping enclosure for an infant or baby with raised sides and ends made of slats or filler bars. Often one side drops down to give easy access to a child
circular cots that are made with walls that have no slats
cots that convert to a toddler bed. When this type of cot is constructed to work as a cot, it must comply with the mandatory standard.
https://www.productsafety.gov.au/standards/household-cots

If the cot features a moving drop side, ensure that the locking mechanism is functional and operates safely with repeated use.
https://www.productsafety.gov.au/products/babies-kids/kids-furniture/household-cots

Red Nose recommends that a safe cot is one that meets Mandatory Australian Standards (AS/NZS 2172)
Only use a single, firm, mattress that fits snugly (within 20 mm of sides and ends) into the cot. The mattress must be flat (not tilted or elevated). Do not use cot bumpers or soft bedding as these have been associated with fatal sleep accidents.
https://rednose.org.au/article/what-is-a-safe-cot

This didn’t answer the actual question. Telling us the cots have to follow a certain rule doesn’t give us tour organisation’s answer to the question about whether you consider them safe.

Product Safety Australia develop & monitor safety standards in Australia.
Red Nose supports these safety standards.
The safety standards for cots, includes drop-sided cots, includes further information to be aware of for these cots.
If the cot features a moving drop side, ensure that the locking mechanism is functional and operates safely with repeated use.
https://www.productsafety.gov.au/products/babies-kids/kids-furniture/household-cots

If any cot, including drop sided cots meet the Mandatory Australian Standard, then Red Nose would support the use of this cot, from a safety perspective.