I guess that you did not read the fine print. If you read the post again, directly under the 3 points listed, it says...
Additionally:
Boulwarism was determined by the Board and the appellate court to represent bad faith bargaining. In the court decision, the critical issue was the combination of tactics, each of which might have been legal in the abstract. By combining specific tactics which may be legal into an overall effort to circumvent the union, the company had engaged in bad faith bargaining.
Additionally, the NHL have made several different proposals with differing levels of salary cap. This does not matter though, since you completely ignored...
Under Section 8(d), neither party is required to make concessions or agree to a proposal. As a result, hard bargaining by itself is presumably legal.
In case you are not aware, the section 8(d) they are refering to is taken from the NLRA...
(d) [Obligation to bargain collectively] For the purposes of this section, to bargain collectively is the performance of the mutual obligation of the employer and the representative of the employees to meet at reasonable times and confer in good faith with respect to wages, hours, and other terms and conditions of employment, or the negotiation of an agreement or any question arising thereunder, and the execution of a written contract incorporating any agreement reached if requested by either party, but such obligation does not compel either party to agree to a proposal or require the making of a concession: Provided, That where there is in effect a collective-bargaining contract covering employees in an industry affecting commerce, the duty to bargain collectively shall also mean that no party to such contract shall terminate or modify such contract, unless the party desiring such termination or modification--
http://union-organizing.com/nlra.html
As for the "Broad Management Clause", I searched the Dec 14th proposal, Feb 9th compomise proposal, and Feb 15th final offer, but found nothing saying "broad management". So, perhaps you could be kind enough to post what you are talking about.