I don't know if this is anything new or not - can't say I've noticed it before but I don't study their website in any particular detail........... from the Thai Consulate at Hull UK's website:

 

'At the end of the 60-day stay (or 90-day if you have obtained a 30-day extension) it will be necessary to exit Thailand. If exiting to a neighbouring country and re-entering Thailand by air or overland without a visa as a tourist you should be allowed a stay of either 15 or 30 days according to your nationality. However, this is entirely at the discretion of the Thai Immigration at the time. Please be aware that if entering Thailand by air without a visa you will be allowed a maximum of three 30-day entries within any 12-month rolling period. Also be aware the Royal Thai Embassies and Consulates in neighbouring countries may restrict the number of visas they will grant to nationals of countries other than the country where the Royal Thai Embassy/Consulate is located.'

 

http://www.thaiconsul-uk.com/tourist-visa-single-tr.php

That's very outdated, that was removed ages ago. 

They also have the 15 days entry at land-border that also was removed some years ago. 

4 minutes ago, PoorSucker said:

That's very outdated, that was removed ages ago. 

They also have the 15 days entry at land-border that also was removed some years ago. 

You may be correct but it hasn't been removed from their website - if I remember rightly, they re-hashed their website last year but I suppose they could have just pasted in the old information.

The information on consulate websites is notoriously unreliable. You should also not trust anything consular officials tell you verbally about anything other than the specific services they provide.

 

That said, while I do not think the specifics on visa exempt entries they report are accurate, it is true that

• visa exempt entry is at the discretion of the immigration officials;
• there is a hard limit of two visa exempt entries per year when entering via a land crossing (apart from at Poipet/Aranyaprathet, granting of those two visa exempt entries is pretty automatic); and
• each airport has its own guidelines (unannounced publicly) on when visa exempt entry will be allowed.  At the current time it seems the most important factors are
  (i) extra scrutiny if you have six or more visa exempt entry since around the middle of 2015; and
  (ii) a tendency to deny visa exempt entry if you have spent more than about 180 days in Thailand in the previous 12 months.

The bottom line is to avoid entering visa exempt (especially via airports) if you have spent a lot of time in Thailand as a tourist in recent years.