With my browser I can toggle your pin status on the Blynk server.
{"id":1751593800,"parentId":-1,"isPreview":false,"name":"led","createdAt":1500797703644,"updatedAt":1500831243213,"widgets":[{"type":"BUTTON","id":199475,"x":0,"y":0,"color":600084223,"width":2,"height":2,"tabId":0,"isEnabled":true,"isDefaultColor":true,"deviceId":0,"pinType":"DIGITAL","pin":4,"pwmMode":true,"rangeMappingOn":false,"min":0,"max":1,"value":"0","pushMode":false}],"devices":[{"id":0,"name":"led","boardType":"NodeMCU","token":"xxxxxxxxx","connectionType":"WI_FI","status":"OFFLINE","disconnectTime":1500828455839,"lastLoggedIP":"47.9.213.252"}],"theme":"BlynkLight","keepScreenOn":false,"isAppConnectedOn":false,"isShared":false,"isActive":true,"hardwareInfo":{"version":"0.4.8","boardType":"NodeMCU","buildDate":"Jul 23 2017 13:50:12","heartbeatInterval":10},"pinsStorage":{"0-d2":"1"}}
See {“0-d2”:“1”} but as your ESP went off line at disconnectTime":1500828455839 (4.47PM GMT) then your ESP can’t be updated by a browser of IFTTT.