@kingleviathan Thanks for confirming that resetting the indexables table and rerunning the SEO data optimization has corrected the issue.
Regarding the .svg file on the page you mentioned, that seems to only be referenced twice in the source code in the same section around line 2749 in the following section (see image here):
<div class="wpb_wrapper">
<p style="text-align: center;"><img class="alignnone size-medium wp-image-2109" src="data:image/svg+xml,%3Csvg%20xmlns='https://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" alt="Banjo Logo with Banjo Review words under it" width="300" height="300" data-lazy-srcset="https://www.fastbusinessloans.com.au/wp-content/uploads//2021/02/banjo-review.svg 150w, https://www.fastbusinessloans.com.au/wp-content/uploads//2021/02/banjo-review.svg 300w, https://www.fastbusinessloans.com.au/wp-content/uploads//2021/02/banjo-review.svg 1024w" data-lazy-sizes="(max-width: 300px) 100vw, 300px" data-lazy-src="https://www.fastbusinessloans.com.au/wp-content/uploads/2021/02/banjo-review.svg" /><noscript><img class="alignnone size-medium wp-image-2109" src="https://www.fastbusinessloans.com.au/wp-content/uploads/2021/02/banjo-review.svg" alt="Banjo Logo with Banjo Review words under it" width="300" height="300" srcset="https://www.fastbusinessloans.com.au/wp-content/uploads//2021/02/banjo-review.svg 150w, https://www.fastbusinessloans.com.au/wp-content/uploads//2021/02/banjo-review.svg 300w, https://www.fastbusinessloans.com.au/wp-content/uploads//2021/02/banjo-review.svg 1024w" sizes="(max-width: 300px) 100vw, 300px" /></noscript></p>
</div>
This area appears to be related the ‘Banjo Review’ object shown here, and was likely created by your page builder (it appears to be created in WPBakery or Visual Composer).
The URL of the .svg in question is likely configured as an absolute URL in the image source setting of this object which is why it is still referencing HTTP instead of HTTPS.
To resolve this we would recommend checking that particular module and see if you can reset the image source URL to the HTTPS version of the .svg resource.