@Mystiky 

Publish date is misleading.  It could simply be that older firmware were missed previously when upload and did not get published.  When noticed we will often post the older firmware not to confuse customers but to see what had been added to firmware previously.  

What you do want to look at is the build number at the end of the FW name.  The most recent is 210719.

@Mystiky 

Yes the firmware is from July.  We can tell from the build number which is the date of the firmware.  As I mentioned previously at time firmware might have been missed and not published.  This could even be seen as old firmware, especially for routers that are connected to the cloud via a TP-Link ID.  This is because these routers can receive updates OTA (over the air).  This cloud server is loaded automatically and does not need human intervention like the website does.  If you did an OTA update back in July that is likely why you have the FW already.

Also please not that Typically FW updates are only provided If there is a need for it.  Such as patching a security flaw that is found, repairing a bug or adding a feature.  If a FW is solid and there are no needs for an update it could be sometime between updates.  This doesn't mean that the product is not being supported or anything like.  Rather it is just that the router is solid and we do not know of any specific concerns at that particular time.