Hello, I notice many of your resources suggest only using a safe sleeping bag with fitted arm and neck holes. I have noticed many 'angel style' sleep sacks on the market such as the 'love to dream' and various cheaper varieties at chain stores. Are these considered safe by red nose? Or is a muslin/cotton swaddle considered preferable? Thank you.

The sleeping bags you refer to in Red Nose information are Sleeping Bags, whereas the sleep sacks such as Love to Dream that you refer to are in fact swaddle suits.
Red Nose recommends using a muslin or light cotton wrap for use as a swaddle.
Once baby is showing signs of rolling, swaddling should be discontinues.

Red Nose also has the following information (in part) about swaddle suits.(See full article in link below)

wrapping and swaddle products
The material of the wrap or swaddle should not cover the face or head, particular if baby sleeps with arms in different positions. If the item is too big for the baby, some zipped swaddle suits that enclose baby’s hands, have been shown to allow material to cover baby’s face and nose when baby raises their hands above their head during sleep. All sleeping attire designed to cover the baby’s shoulders should have separate neck and arm holes or should ensure that they do not allow the face covering if the baby was to move their arms in different positions.
Any product that is used as clothing on the baby or in the baby’s sleep environment should not restrict the movement of a baby who is able to roll.
Wrapping should be discontinued as soon as the baby shows the first signs of being able to roll.
Positioning aids that restrict movement of the baby are not recommended and have been associated with infant deaths.
https://rednose.org.au/article/wrapping-babies

It is important for parents when they are thinking of buying a product for their baby to be able to make the best informed decision based on evidence of product safety. This is crucial for preventing SUDI or other fatal sleeping accidents.

It is often assumed that all nursery products sold in retail stores must be safe, however many products have never been formally tested so it can be difficult to tell what is safe for your child.
https://rednose.org.au/article/baby-safe-sleeping-products