I did report these issues via the form first, but seeing as around a month has passed and nothing has changed, I thought to post about these here as well.
#1 Lua Functions
There's a bit that reads: "For security reasons, the dofile(), load(), loadfile(), and loadstring() functions are not available in Corona.", however, loadstring() is in fact supported by Corona, as has been pointed out by Rob at https://forums.coronalabs.com/topic/72285-how-does-it-work-today-can-downloaded-lua-be-loaded-dynamically/ and https://forums.coronalabs.com/topic/75355-can-you-trust-loadstring-on-all-compiled-platforms/. I even sumbled upon it in Corona's shell.lua (https://github.com/coronalabs/corona/blob/master/platform/resources/shell.lua#L988).
There has been an undocumented change with to the timer for months now, read https://forums.coronalabs.com/topic/75068-20193468-timer-fixes-are-terrible-and-unnecessary/page-2?hl=performwithdelay. This "timer.allowIterationsWithinFrame" is not documented, but it really should be because otherwise its existence will be forgotten over time.
#3 Audio formats
There's a line: ".mp3 has various patent and royalty issues, but when .aac was ratified, it was agreed that there would be no royalties required for distribution.", however, the last mp3 patents expired back in 2017. This sentence would now correctly read: ".mp3 no longer has any patent or royalty issues, but when .aac was ratified, it was agreed that there would be no royalties required for distribution." As this sentence makes no sense anymore, it could just be removed entirely.
Sources: https://www.iis.fraunhofer.de/en/ff/amm/consumer-electronics/mp3.html and https://www.theregister.co.uk/2017/05/16/mp3_dies_nobody_noticed/
Now, for the mandatory audiovisual aid to accompany my post