[SalesForce] Using the HTTP status code parameter in HTTPPost and HTTPost2 AMPscript functions

According to the documentation for HTTPPost and HTTPPost2, you should be able to retrieve the HTTP status code from the response payload, but I can't seem to get this to work. I can only retrieve the response body. Here's a request that I've tried with both functions:

%%[
var @httpPostCallStatus, @httpPost2CallStatus, @httpPost2Response
HTTPPost('https://httpbin.org/post', 'text/html', 'hello', @httpPostCallStatus)
HTTPPost2('https://httpbin.org/post', 'text/html', 'hello', true, @httpPost2CallStatus, @httpPost2Response)
]%%

HTTPPost call status: %%=v(@httpPostCallStatus)=%%

HTTPPost2 call status: %%=v(@httpPost2CallStatus)=%%

HTTPPost2 reponse: %%=v(@httpPost2Response)=%%

This returns the following:

HTTPPost call status: {
  "args": {}, 
  "data": "hello", 
  "files": {}, 
  "form": {}, 
  "headers": {
    "Content-Length": "5", 
    "Content-Type": "text/html", 
    "Host": "httpbin.org", 
    "Singularityheader": "appId=796*ctrlguid=1485623992*acctguid=c6f9028b-9792-49f7-a36f-01b2bd8101dc*btid=68226*guid=c4b32254-2d88-4188-8196-a3e17dde6485*exitguid=104*unresolvedexitid=0*cidfrom=251*etypeorder=HTTP*cidto={[UNRESOLVED][3609894]}"
  }, 
  "json": null, 
  "origin": "136.147.128.1", 
  "url": "https://httpbin.org/post"
}

HTTPPost2 call status: {
  "args": {}, 
  "data": "hello", 
  "files": {}, 
  "form": {}, 
  "headers": {
    "Content-Length": "5", 
    "Content-Type": "text/html", 
    "Host": "httpbin.org", 
    "Singularityheader": "appId=796*ctrlguid=1485623992*acctguid=c6f9028b-9792-49f7-a36f-01b2bd8101dc*btid=68226*guid=c4b32254-2d88-4188-8196-a3e17dde6485*exitguid=106*unresolvedexitid=0*cidfrom=251*etypeorder=HTTP*cidto={[UNRESOLVED][3609894]}"
  }, 
  "json": null, 
  "origin": "136.147.128.1", 
  "url": "https://httpbin.org/post"
}

HTTPPost2 reponse: System.Data.DataRow[]

Am I doing something wrong here, or is the documentation simply incorrect?