Just confirming that changing the CNAME to ext-cust.squarespace.com through the domain provider fixed the issue! It did take about 48 hours to take effect. Thanks again for the help!
I would suggest that you delete the www - ext.squarespace.com record in freeparking and then replace it, that may be enough to fix this error. If not then talk to freeparking support to see why the record may have been depreciated.
This happened because of a change by Squarespace.
Squarespace now require this CNAME record to point to ext-cust.squarespace.com instead of ext.squarespace.com. You can change this by logging on to your domain host's DNS Settings and editing this record to point to the new location. The warning should disappear within 24 to 72 hours.
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/scrollax@1.0.0/scrollax.min.js"></script>
<script>
$('.has-background').attr('data-scrollax-parent', 'true');
$('.has-background .section-background').attr('data-scrollax', 'properties: { translateY: "30%" }');
$.Scrollax();
</script>
<style>
.has-background {overflow: hidden;}
</style>
The above update #2 from https://schwartz-edmisten.com/blog/how-to-add-parallax-to-squarespace-7-1 seems to work fine without messing up the quality of the image